Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccc882c18d927b5…

MALICIOUS

PDF

1.17 MB Created: 2009-12-17 03:14:38 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0.5 (Windows))
MD5: 955bade419a9ba9e5650ccb3dda88844 SHA-1: b17eda55b10d1c19fee06e1bdc2afa561adadb20 SHA-256: 8ccc882c18d927b57a33f8c6bae4d0eec3290ac7ab1d1157725918feab76ec01
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is flagged as suspicious. Critical heuristics indicate the use of eval() and unescape() functions, along with a specific exploit for CVE-2009-4324 (media.newPlayer). This suggests the JavaScript is obfuscated and designed to exploit a known vulnerability to achieve code execution. The embedded JavaScript file 'javascript_obj0031_000.js' is likely responsible for downloading and executing a second-stage payload.

Heuristics 8

  • 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. (matched in decompressed stream)
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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.
  • 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0031_000.js
877a10d59635aef9785fe7264185a7f164e8a76100ae88bac1b4abbab850ad86		 pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 3108 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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