PDF malware analysis — malicious · 91a5e70c6917db57

MALICIOUS

PDF

3.4 KB Created: 2009-02-02 19:59:25 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 511ac6f9e9aabf8f1c8075c5025b78b8 SHA-1: 2aa16e76f3b23de4a0ab6a4b55458cba29345409 SHA-256: 91a5e70c6917db574f47c206d0a35e134ea4503f5bf28cb48f17d80a8c6f8029

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript utilizes eval() and String.fromCharCode() for obfuscation, suggesting an attempt to download and execute a second-stage payload. The presence of deobfuscated.js further supports this, although its specific actions are not detailed here. The primary attack vector appears to be exploiting PDF vulnerabilities through embedded scripts.

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` `3544f9ffc1154f97a9418788e224867a30ef54a2647f2bca9259da68c987a050`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7166 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` `54229f2f42116f7cdd9337d0dce02606db46c997e514a23c8d1aef1ac1604d6e`	deobfuscated-js	PDF JavaScript deobfuscation pass	16681 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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