PDF malware analysis — malicious · 291026511d4a7fab

MALICIOUS

PDF

21.4 KB

MD5: e7482dff3df4821aa626f336611fbe42 SHA-1: 46c2fa97bb6297eaaae3f945d839bc133e9558e1 SHA-256: 291026511d4a7fab0197a90b518058635d8572dd389503612d8a4b2402b9393c

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF document contains embedded JavaScript and triggers CVE-2009-4324 via the media.newPlayer annotation API. The ML classifier strongly indicates maliciousness. The embedded JavaScript, specifically the deobfuscated legacy_pdfkit_stage_000.js, is designed to execute further malicious code, likely by downloading a second-stage payload. The obfuscated nature of the script and the use of a known PDF exploit suggest a downloader or dropper functionality.

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` `254f6eb322ab6409830e28d23d86f32d69f3fa514e68558f250ae8b260deeed7`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2221 bytes
`legacy_pdfkit_stage_000.js` `c3df0b6d669953258363ab802ac0d32c63d5685d76eb2e0ad1f70f86b924f691`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAC8	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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