PDF malware analysis — malicious · c2c4b9a1faaf2405

MALICIOUS

PDF

77.2 KB Created: 2009-04-06 21:22:27 Authoring application: KXpI2mEX (via YgUp4K27RQYzx3)

MD5: a15bbb3b44b4fec49d874ea17cf6a039 SHA-1: 2bfbb2dfcc9babed7c726be28c8020b0a7bb7ece SHA-256: c2c4b9a1faaf2405f6e873ebf997f56597a0f4c8c2052d0d867e871c48d7f403

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, including the use of eval() and String.fromCharCode, making its exact function difficult to determine statically. However, the ML classifier strongly flags this PDF as malicious. The presence of obfuscated JavaScript suggests the intent is to download and execute a second-stage payload.

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` `e02ad14c15cd6fb8b8513e4ec897120935168b9d21565ce8e00834fedd887c3a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	77821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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