PDF malware analysis — malicious · c21e2d979ec5891a

MALICIOUS

PDF

3.2 KB Created: 2008-08-15 00:17:17 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 7b8278eac0afc4a30959e1150270335e SHA-1: 2254ecbbf4f6f3372f8cecfef4a3aed561e373a1 SHA-256: c21e2d979ec5891a7899b2a9d44a227bc707adc0d7736676e677ac0b5b6dbfbb

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode suggests obfuscated code execution. The extracted artifacts 'javascript_obj0013_000.js' and 'deobfuscated.js' further confirm the use of JavaScript. The primary function of this script appears to be downloading and executing a secondary payload, though the exact URL or execution method is not directly extractable from the provided evidence. The confidence is moderate due to the obfuscation and lack of a clear final payload indicator.

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` `ad5d8c59d33d0caebea072c66a10a2a1668e036493b2a439f825901717c59a71`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5463 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` `fa39bfeeebb8c0095b1fe34199784110d62e8241923741ed424cdbb5b70073f7`	deobfuscated-js	PDF JavaScript deobfuscation pass	12668 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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