PDF malware analysis — malicious · bbea97a64219efd9

MALICIOUS

PDF

2.8 KB

MD5: de8f3f908bfa69ea5a094f79f8d43d17 SHA-1: 07d2b8ef0668a2e978ae87a7df0b3487bc9a4047 SHA-256: bbea97a64219efd922902eb722f0a7a6f276157795b76750655f2f39535fd3a2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The JavaScript streams, particularly javascript_obj111612_001.js, are highly obfuscated and contain eval() calls, suggesting they are designed to download and execute a second-stage payload. The specific obfuscation techniques and lack of clear indicators prevent definitive family attribution.

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_obj111611_000.js` `742219222aece985e898811383bca750504e8851074e0f7f869c8c5e297a15b8`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `51c6cb7f455d4505e4232750c5264fff236c2ae9d91a142af882c4277a4ae274`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3349 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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