PDF malware analysis — malicious · af5f41b242a2446e

MALICIOUS

PDF

21.4 KB

MD5: ef89f83e3ee1892bc285fae5ce645320 SHA-1: 7fdad5b6ea3790d973e8a9e0d037cc03b11808b8 SHA-256: af5f41b242a2446eefcdc960b5235f397d6aa7c74bfa7e98ad0458113d901812

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, flagged by multiple heuristics including ML classification and ClamAV. Specifically, the CVE-2009-4324 heuristic indicates the use of the media.newPlayer API to trigger an exploit. The embedded JavaScript, particularly 'legacy_pdfkit_stage_000.js', is likely responsible for executing the exploit payload. The presence of obfuscated JavaScript and the critical heuristic firings strongly suggest malicious intent, likely to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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)
ClamAV: Pdf.Exploit.Agent-17464 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-17464
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` `d9755079f6784d4d18334a814d489ad481ff953452edf8d769affb7ab66e208d`	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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