PDF malware analysis — malicious · 4140e0e2a944a0d1

MALICIOUS

PDF

46.2 KB

MD5: f8db795e3e1f948c43aaf8be47cd72f7 SHA-1: 813267a2e74f73d193facd4ce753c518c577360f SHA-256: 4140e0e2a944a0d13d023317452d04b60d4e9afd1c490f4ec4e150eebc84b762

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2009_4324 heuristic indicates exploitation of a known PDF vulnerability via the media.newPlayer API. The ML classifier also strongly indicates maliciousness. The embedded JavaScript, specifically the deobfuscated legacy_pdfkit_stage_000.js, appears to be designed to download and execute a secondary payload, as suggested by the ML_NYX_PDF_MALICIOUS heuristic and the presence of obfuscated script indicators.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `c7d005be51b98fd2c508e11fa797ac57789678864184fb2d49ee66a2137b33c6`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2578 bytes
`legacy_pdfkit_stage_000.js` `d7155f873b59e589a73c704be477a30cf4921d43cb2c81abc4b0960cad6f3280`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC2D	1220 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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