PDF malware analysis — malicious · f0561a2458775815

MALICIOUS

PDF

79.1 KB

MD5: d68b3ccddd0a49eff05256f4c593a750 SHA-1: e43637d44c045b6bfafc7790e6b5f878e4eb033c SHA-256: f0561a24587758157a2f7ad44ef7faaddac294d5083345cc7514061a4b31d908

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

This PDF document contains embedded JavaScript, flagged by multiple heuristics including a critical alert for CVE-2009-4324. The ML classifier strongly indicates maliciousness. The embedded JavaScript, specifically 'legacy_pdfkit_stage_000.js', is likely responsible for downloading and executing a secondary payload, as suggested by the 'Suspicious extracted artifact' heuristic. The exploit targets the 'media.newPlayer' functionality.

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` `4d64b5109a10713540b425b474ec8ffc544ae41e14ab742502919bfc29cb17e7`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`legacy_pdfkit_stage_000.js` `ef9ec0f5db8df6829bb94425efef4dfb2187fc146dd24c0101cb0acf955ebd2e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x101A	2552 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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