PDF malware analysis — malicious · 8942e6a13fe62334

MALICIOUS

PDF

40.5 KB

MD5: f6d9108090c841c7e4da9501aa445167 SHA-1: a93756f962730b4bb5425b4507b73c1d9bac03b6 SHA-256: 8942e6a13fe62334ad7151f43d9fb9e4ab76acb9b70f37e7df5f1a4d5c6224fc

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript/JScript

The PDF file contains embedded JavaScript and triggers the CVE-2009-4324 vulnerability via the media.newPlayer API. The ML classifier strongly indicates maliciousness. The embedded JavaScript, though partially obfuscated, appears to be designed to download and execute a secondary payload, as suggested by the 'legacy_pdfkit_stage_000.js' artifact. The specific exploit used is CVE-2009-4324.

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` `245a99711f69ccf93c185162433e683a40d9606d721599601100bfb8df770b43`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2461 bytes
`legacy_pdfkit_stage_000.js` `ada8be7fcbbba2749cefe5122fc7e86dce72eb1b6eeddf6c5a324ca92ef02182`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xBB8	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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