PDF malware analysis — malicious · 262f6d1fc90b5f02

MALICIOUS

PDF

79.3 KB

MD5: dcff4e10f95504f5e5bd764840419394 SHA-1: 90b52fbb91ab20984f923e1579e6b275f09fcbd4 SHA-256: 262f6d1fc90b5f028e5b2d67fddd5a51df135ed6901131fa575e5985e5b233bd

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This PDF file exploits CVE-2009-4324 using embedded JavaScript. The ML classifier strongly indicates maliciousness. The JavaScript, identified as legacy_pdfkit_stage_000.js, is likely responsible for downloading and executing a secondary payload, a common technique for initial access.

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` `f5fc62509ff49e0062908fba47b83a3ead9f8104d2499323a69ea8cd7877c310`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3766 bytes
`legacy_pdfkit_stage_000.js` `0a2b026bba8c4efb09566d695a2b6752bac3070fad4f3306884b493ab4e9e31d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x10D1	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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