Malicious PDF / .VIR — malware analysis report

Static analysis result for SHA-256 dec9e67a9cedf353…

MALICIOUS

PDF / .VIR

173.6 KB
MD5: 5b054eea4b72f069d097d4999eb67426 SHA-1: 62af487b7adc2510c0cc3da804a5ca004c762a54 SHA-256: dec9e67a9cedf3535e429b6d258da3fbf1ec23f04bf253cc34ce20242d6f612f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability (media.newPlayer) to execute arbitrary code. The JavaScript is obfuscated but appears to be designed to download and execute a second-stage payload. The critical heuristic firing for CVE_2009_4324 strongly indicates exploitation of this specific vulnerability. The extracted JavaScript file, 'javascript_obj0008_000.js', and its deobfuscated version, 'legacy_pdfkit_stage_000.js', further support the presence of malicious JavaScript.

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)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Suspicious extracted artifact medium 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.
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
7fed9042b76a7424da8d49b2eec793dca2ff76f7347696c6535ca8c3485b9180		 pdf-javascript-stream PDF /JS object 8 at offset 0x210 2960 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x210 126 bytes

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