PDF malware analysis — malicious · 7d9bf328fb1baae8

MALICIOUS

PDF

1.95 MB Created: 2008-11-01 22:47:06 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 12f8241b67bfb2f5a0efc261a927f342 SHA-1: 664b30f107a983419c6aab30f495d76ee2479ba3 SHA-256: 7d9bf328fb1baae8228c846b3033300bc3b3bc92483ecc85b3de9804d60ae1f8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests obfuscated JavaScript code designed to execute arbitrary commands. The ML classifier strongly flags this PDF as malicious. The deobfuscated JavaScript likely downloads and executes a secondary payload, a common technique for initial access and further system compromise. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_000.js` `28807bd6f3531d6b3d6c8638cd2ef6087ad0aa5d14c79c4b0f9516f4e224f3b7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5453 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `7508c9a46abf05546031b70759c37bab2e57030957237ffd9150774c1967a91a`	deobfuscated-js	PDF JavaScript deobfuscation pass	12385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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