PDF malware analysis — malicious · 3474d69ea70de73f

MALICIOUS

PDF

59.3 KB Created: 2009-05-23 18:42:04 Authoring application: exrbpOOOSnarxLlh (via aAfTtZvKnhkQnYM)

MD5: 0597454ad19360c2f5d70859aac7315e SHA-1: 368c18cbd8039c56ab926d959580a5e78afcc786 SHA-256: 3474d69ea70de73f832cec400be1c87ac93857f7407bddf185a03b564e6e767d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is obfuscated using String.fromCharCode and eval() calls, indicating an attempt to hide malicious functionality. The presence of a large JavaScript file suggests it is likely responsible for downloading and executing a second-stage payload. The document body itself is heavily truncated and unreadable, providing no direct clues to the lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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_obj0007_000.js` `849a8831ecfb6b67a7e4d223b2150ef5d3337934dcb6213df8182c1215ba5b69`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4A4	58854 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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