PDF malware analysis — malicious · efe446006c988f88

MALICIOUS

PDF

5.9 KB Created: 2009-09-05 12:48:00 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: f26b1754669b5b7f156333434e750449 SHA-1: 9d197b0c9f1a22f2de8c539a9116954fd6687702 SHA-256: efe446006c988f88e3607743a16d5c05ac420c11d7331f6ecc5a51251b3dfd4d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream is heavily obfuscated, utilizing `unescape()` and `String.fromCharCode()`, indicating an attempt to hide malicious code. The ML classifier strongly suggests maliciousness. The primary function of the obfuscated script appears to be downloading and executing a second-stage payload, as evidenced by the extracted artifact 'javascript_obj0013_001.js'.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `9a9ec5d20726956e89a4e573dad8aa45558285b317e46737374b30b85042eaa1`	pdf-javascript-stream	PDF /JS object 13 at offset 0xBFC	10782 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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