Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0312a26f88859a…

MALICIOUS

PDF

230.0 KB Created: 2010-01-07 11:07:02 +08:00
MD5: 5b57ef4723a7a953a6feec968e55cefc SHA-1: 2e3cbfc763353e74357f9668b52dc9ef11a7b896 SHA-256: bb0312a26f88859aeceb2ceb4ce603e100f7fac0d277ebd2dc889f002857c5ff
144 Risk Score

Malware Insights

The PDF file contains embedded JavaScript that exploits CVE-2009-4324, a known vulnerability in Adobe Reader. The critical heuristic firing for CVE_2009_4324 indicates that the PDF uses obfuscation techniques to hide the exploit. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, leading to a malicious outcome.

Heuristics 6

  • 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-20475 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-20475
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x674 126 bytes
objstm_0026_00.bin
1927301306a8a9b7ed09f153bcb6dbe394efd284902831ca549fbd446c3a8d21		 pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 306 bytes

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