PDF malware analysis — malicious · 57942bb2f02d6602

MALICIOUS

PDF

21.4 KB

MD5: e7397856d82add05a34d796f0929ad05 SHA-1: d52778db2b44a730c575565f91bb1272649cf3cf SHA-256: 57942bb2f02d6602fcec3286e2b848f351656bad1e3fb06d867a68777b5373f2

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript T1059.007 JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including a critical alert for CVE-2009-4324 (media.newPlayer). The ML classifier strongly indicates maliciousness. The embedded JavaScript, particularly the deobfuscated legacy_pdfkit_stage_000.js, is designed to exploit this vulnerability, likely to download and execute a secondary payload. The obfuscated nature of the script and the use of a known exploit point to a downloader or dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `7e6f830246ed4d1d58679bcd3fe32cb88b8344cbfe8a8e5b3b1241d42cc69d0f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2205 bytes
`legacy_pdfkit_stage_000.js` `c3df0b6d669953258363ab802ac0d32c63d5685d76eb2e0ad1f70f86b924f691`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAB8	1256 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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