PDF malware analysis — malicious · 2c3dfa471b851943

MALICIOUS

PDF

80.3 KB

MD5: d81f6511da78599bfb71f6c5ea94b078 SHA-1: 19683a2b594efdadd7cb88df9a9e16c1c2c0af6a SHA-256: 2c3dfa471b8519439d0e68a7183ab1d6a23e4f55a414aeb5089c9169ab5d047f

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

This PDF sample was flagged as malicious by an ML classifier and exhibits multiple heuristic firings related to embedded JavaScript and a specific exploit (CVE-2009-4324). The embedded JavaScript, particularly in the deobfuscated file legacy_pdfkit_stage_000.js, is indicative of a downloader or initial execution stage. The exploit targets the media.newPlayer API via annotation actions, a known technique for initial compromise. The overall pattern suggests an attempt to leverage a PDF vulnerability to deliver further malicious content.

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` `58396b7c5b197dea675eb0e586e24038cf43b72032327130fde5933865be50b4`	pdf-javascript-stream	PDF /JS object 8 at offset 0x217	3783 bytes
`legacy_pdfkit_stage_000.js` `2fdabff677ccce7076a8b35c815377bbd0cecaf7bcf5bcbd8245694150d71bf6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x111A	2586 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 0x217	81 bytes

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