PDF malware analysis — malicious · 4eef8a8a88c6af50

MALICIOUS

PDF

79.1 KB

MD5: 5fcb5e3546d7d745d81f0ca99889a550 SHA-1: 58344da1f3c1bef2e9f6f329777e6a2eadb25a8d SHA-256: 4eef8a8a88c6af50d1c8923d75fe3b9bde6064f6f2dd3ad0a342b4edb5fcd5f2

78 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2009_4324 heuristic specifically points to the exploitation of a vulnerability related to media.newPlayer, which is often used to launch malicious scripts. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, likely contains the payload execution logic, although its exact function is obscured. The presence of these elements suggests the document is designed to exploit a PDF reader vulnerability to execute arbitrary code.

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` `95150c0cbf0280caceb6ffc83e598717af9ef1e66cf26ad413cb4f0bbf4fb11a`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`legacy_pdfkit_stage_000.js` `a269e935e0b7c56d38baff9b1dd992d545670e3a8c288813c902c4d704a17ef3`	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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