PDF malware analysis — malicious · 56b79e30c27b840e

MALICIOUS

PDF

21.4 KB

MD5: f1d82bb868f84886aaeb3d99dca63937 SHA-1: 72828deccd785741c3d45b250bf3220a916827c2 SHA-256: 56b79e30c27b840e56243d1a75db850a9febcfff714f830c834725931a42071b

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript and triggers a critical vulnerability, CVE-2009-4324, related to media player exploits. The embedded JavaScript, particularly in legacy_pdfkit_stage_000.js, appears to be obfuscated but is designed to execute code. This combination strongly suggests the PDF is a malicious dropper intended to exploit the vulnerability and download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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)
ClamAV: Pdf.Exploit.Agent-17648 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-17648
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `57788f8e4e3f840e4f56099f7436eac458269fa31d13214b8b298c61fd0e82ea`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2205 bytes
`javascript_obj0008_001.js` `38a2e438a0e1a4633c0dcd6b182c2fc132a48f88fe0c8ecc7be04f58de3759a0`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	21353 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `c3df0b6d669953258363ab802ac0d32c63d5685d76eb2e0ad1f70f86b924f691`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAB8	1256 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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