PDF malware analysis — malicious · 1b7327f8e1de9084

MALICIOUS

PDF

4.1 KB

MD5: 6b960acb13cfb1158c657bda828e6271 SHA-1: 78fd1c1a18ba24f0dbf6d49f0ce80becf8b95eea SHA-256: 1b7327f8e1de9084d38efef31109c218b5fd3b68cd8c28e4672d0fc79591f34d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, specifically 'acroform_b64_00.js', shows signs of obfuscation with eval() calls and String.fromCharCode usage. This obfuscated script is likely designed to download and execute a second-stage payload, a common technique for malware delivery. Due to the obfuscation, the exact payload and delivery mechanism cannot be definitively determined, hence the 'unknown family' classification.

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` `efff8c4204f4f8bf991e20c26216dbf7a4c2ec91e9cd1fd0c349acd25f8a5c16`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6373 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` `a0c68b28b3b8a094027a17685f3dae151c9b61deb2b6b4c97625642dd78fa050`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3626 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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