PDF malware analysis — malicious · c9a0c749547b9dbd

MALICIOUS

PDF

43.2 KB

MD5: c77c5a7c998a8c203d259e11120666af SHA-1: 894c03719a5d183ef3efc9d60d506e424b1cc629 SHA-256: c9a0c749547b9dbdd51d4c9bbf8ec812be9827bbd5b0eab58fcc551b444f7a88

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2009_4324' heuristic specifically points to the exploitation of the media.newPlayer vulnerability. The embedded JavaScript, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', appears to be designed to download and execute a second-stage payload, as suggested by the suspicious extracted artifact. The reconstructed JavaScript string "http://www.example.com/payload.exe" (hypothetical reconstruction based on common patterns, actual URL not fully recoverable from provided snippet) would be the primary indicator of the next stage.

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` `de6aad331f1b1e78bb1a20e13fe1dd88aa37d2ac272485a87cddc9a98e0d2e12`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2221 bytes
`legacy_pdfkit_stage_000.js` `e25eb9dea927fc4a67324232040e7bccd1874be12a367fce24d0ca6ae7a3286e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAC8	2744 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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