PDF malware analysis — malicious · b2c6182d4353ab92

MALICIOUS

PDF

15.4 KB Created: 2009-04-23 05:30:52 Authoring application: Lc77Ge (via eE9I3zxfFL)

MD5: 391151b1208ac26658ca584cc1475f1e SHA-1: 4894a9381e195651ae68985905c34daae0743955 SHA-256: b2c6182d4353ab92caf50f9f6de4ed435ef4120ffa48eb347219d6882ec51d1a

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript with high-confidence indicators of maliciousness, including `eval()` and `unescape()` calls. The ML classifier also strongly flagged this PDF as malicious. The JavaScript is obfuscated, making its exact function difficult to determine, but the presence of these functions strongly suggests it's designed to download and execute a secondary payload. The file's metadata indicates it was authored by 'Lc77Ge', which may be a clue to the actor or toolchain.

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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` `3b808c15cd80d55483e91833e51d31095b4366bb4d8ce6a3b50938f38bea3471`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	14527 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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