The answer is a logical extraction via ADB backup. This is the correct first step for locked Android device forensic acquisition because ADB backup can capture app data and system settings without requiring the PIN, root access, or bootloader unlocking, and it does not alter the device state, thereby preserving evidence integrity. On the Computer Hacking Forensic Investigator CHFI exam, this question tests your understanding of non-invasive acquisition methods when facing a locked device; a common trap is to jump to physical extraction or JTAG, which risk triggering lockout or data wiping. Remember the memory tip: “ADB first, don’t make it worse”—always attempt the least destructive logical method before escalating to invasive techniques.
CHFI Mobile and Malware Forensics Practice Question
This CHFI practice question tests your understanding of mobile and malware forensics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An examiner is analyzing an Android device using Cellebrite UFED. The device is locked with a PIN, and the examiner has no PIN. Which acquisition type should the examiner attempt FIRST to maximize data recovery without destroying evidence?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Logical extraction via ADB backup
Option A is correct because when an Android device is locked with a PIN and no PIN is known, a logical extraction via ADB backup is the safest first step. ADB backup (adb backup) can capture app data and system settings without requiring root or unlocking the bootloader, and it does not modify the device state, preserving evidence integrity. This method works if USB debugging was previously enabled, which is common in forensic acquisitions, and it avoids the risk of triggering lockout or data wiping that physical methods might cause.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Logical extraction via ADB backup
Why this is correct
ADB backup can often be performed on a locked device without root, providing a logical copy of user data.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Manual extraction by photographing the screen
Why it's wrong here
Cannot access screen content without unlocking; manual extraction is ineffective.
✗
File system extraction via ADB root shell
Why it's wrong here
Requires root access, which may not be possible on a locked device.
✗
Physical extraction using a bootloader exploit
Why it's wrong here
Physical extraction may require unlocking or may damage evidence if failed; logical is safer first.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the misconception that physical extraction is always the best first step for locked devices, but the trap here is that bootloader exploits or physical methods can trigger data wiping or require unlocking, whereas ADB backup is a non-invasive logical method that preserves evidence integrity when USB debugging is enabled.
Detailed technical explanation
How to think about this question
ADB backup uses the BackupManagerService on Android to create a .ab file containing app data, shared preferences, and databases, but it does not capture the entire file system or deleted data. The backup is encrypted if the device has a full-disk encryption (FDE) or file-based encryption (FBE) enabled, and the examiner may need to brute-force the backup password offline, which is a non-destructive process. In real-world scenarios, this method is often the only viable option for locked devices with USB debugging enabled, as physical extraction via JTAG or chip-off is invasive and risky.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CHFI exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Mobile and Malware Forensics — This question tests Mobile and Malware Forensics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Logical extraction via ADB backup — Option A is correct because when an Android device is locked with a PIN and no PIN is known, a logical extraction via ADB backup is the safest first step. ADB backup (adb backup) can capture app data and system settings without requiring root or unlocking the bootloader, and it does not modify the device state, preserving evidence integrity. This method works if USB debugging was previously enabled, which is common in forensic acquisitions, and it avoids the risk of triggering lockout or data wiping that physical methods might cause.
What should I do if I get this CHFI question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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