PDF malware analysis — malicious · 9a51526d3bf3e4b6

MALICIOUS

PDF

4.0 KB

MD5: ce0da43a12fc343c63e8df511e8f346c SHA-1: 2e60a51fa55ddba72b3742ef08c5d6efff171791 SHA-256: 9a51526d3bf3e4b6706e029aa28b876f94fd0a700524a2dec88c15400b7266f0

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

This PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, specifically 'acroform_b64_00.js', appears to be obfuscated and utilizes eval() and String.fromCharCode, suggesting it's designed to execute arbitrary code. The primary function of this script is likely to download and execute a second-stage payload, serving as the initial access vector for further malicious activity.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `242c43adcfc830486b5b3477223be54a049a9bca6ec5e955dcea749fc45134a6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6245 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `db48502aaf1c818e7670faa3b0a3de868453f86260d31d872359286a89e124e0`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3530 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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