PDF malware analysis — malicious · 55e9230846926ced

MALICIOUS

PDF

21.4 KB

MD5: a51085bc50c9c95efbf5138f0babc021 SHA-1: 5100865527a203be530fa7032b3128acd2fd0b0b SHA-256: 55e9230846926ced9e62aca6f347aa9ed05c0362a81e7834a2e306e37943a6ff

78 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 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 a media.newPlayer exploit trigger. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, likely attempts to download and execute a second-stage payload, which is a common technique for initial access. The obfuscated nature of the script and the use of a known exploit suggest a malicious intent to compromise the user's system.

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` `b9f72f6328b885ee08e815534a24fbddffe3ab822f244ec6756a196b6880bbf9`	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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