PDF malware analysis — malicious · d9c9e4f92d025629

MALICIOUS

PDF

3.4 KB Created: 2009-01-16 18:42:56 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 31fcf042d2b92b5a0201093ae8b15eba SHA-1: 35e40133d1676e01d59843b116918d210694f618 SHA-256: d9c9e4f92d02562912ee9b668f367976ec1e6908e221a428163edb2cb102e1c3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this PDF as malicious. The deobfuscated JavaScript stream likely contains code to download and execute a second-stage payload, although the exact mechanism is obscured. The presence of eval() and String.fromCharCode suggests dynamic code execution and obfuscation techniques.

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` `04837a6f5688030af17d13b3cc1ecef670b21ee381dfb97870fb8865cd818f2b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7173 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` `bd156a9d0c415d898f4558628c8568c9b52bcf047774799790d4e455149befa9`	deobfuscated-js	PDF JavaScript deobfuscation pass	16145 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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