PDF malware analysis — malicious · a72a0a8c7d95cf4d

MALICIOUS

PDF

92.8 KB

MD5: eb221812cf5f9c0ecb673872c4a9fb89 SHA-1: efd26800bb894fafeea2f26ca59cfaca45a48c1a SHA-256: a72a0a8c7d95cf4d45244666f8d68fd5939139d71d1c75ddfa2dedd71928525a

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2009_4324 heuristic indicates the exploitation of a known vulnerability via the media.newPlayer API. The embedded JavaScript, particularly the deobfuscated legacy_pdfkit_stage_000.js, appears to be designed to download and execute a secondary payload, as suggested by the ML_NYX_PDF_MALICIOUS classifier and the presence of obfuscated script content. The specific exploit trigger 'media.newPlayer' is identified as a key indicator.

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` `d4976baf8e44a15bce82ce2b8603690b9f5a5695276ec3e1e1bbef7b2a88946e`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2578 bytes
`legacy_pdfkit_stage_000.js` `ada8be7fcbbba2749cefe5122fc7e86dce72eb1b6eeddf6c5a324ca92ef02182`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC2D	2546 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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