PDF malware analysis — malicious · 2489a95bb7084066

MALICIOUS

PDF

79.1 KB

MD5: e4ba57ab51e2552e3e768a94ad09c202 SHA-1: 1480cba6d6f1a69f67effb2dd039ea6314da9e47 SHA-256: 2489a95bb7084066d5c0417abeb7a4b3d2e2ca158f89aee48dc910815136a13f

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF document contains embedded JavaScript, flagged by multiple heuristics including a critical alert for CVE-2009-4324 (media.newPlayer). The ML classifier also strongly indicates maliciousness. The deobfuscated JavaScript, named 'legacy_pdfkit_stage_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for PDF-based malware delivery. The specific exploit and the presence of JavaScript point towards a drive-by download attack vector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `9b150ec6922f06f62ca2df2cec8d3349100203a6c11e9aa00e31a267acfd4acd`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`legacy_pdfkit_stage_000.js` `dbb326f9ab28c24e745edc41cf3827e86e38227fd6b1b28860c777c5d18f5ae1`	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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