PDF malware analysis — malicious · a293428354d5b453

MALICIOUS

PDF

3.2 KB Created: 2008-11-18 17:54:32 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: a521e903be8d630cf0f36d4a8297604e SHA-1: 1ff6a6a0955095a2046529bb2bf68ef8f099f293 SHA-256: a293428354d5b45339f8e95227a90956431888c1afcc5c83e3d102ae0d514e4b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL heuristics. The ML classifier also flagged it as malicious with high confidence. The deobfuscated JavaScript likely downloads and executes a second-stage payload, although the exact mechanism is obscured. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `3bb4f7b923f776106d970533f000396bb89a24e3c98ce2acbab6e46045e06c3c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5410 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` `fa974530d05eafda572096e6b1b7af4bb7985e87c4950ba94d0d2253bda5f714`	deobfuscated-js	PDF JavaScript deobfuscation pass	11760 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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