Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d4f81e42405f73…

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: 1b35a8f6775259cb72937cae88cd8784 SHA-1: 5205f19fba08cc6afa03c6c1911536759e2a611f SHA-256: 85d4f81e42405f735f3c4477f12c39cf1c5f68bb656a7815f23b4a904e39bca7
84 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. A critical heuristic, 'CVE_2009_4324', specifically points to the use of media.newPlayer and JavaScript hex-escape properties, suggesting an exploit targeting this CVE. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as is common with this type of PDF-based attack. No specific malware family could be identified.

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)
  • 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
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0031_000.js
67d16badf36b4d8c67c0c47adb9f01a2eaa60fa09fbb30364a16791a02d36c18		 pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 4833 bytes
js_property_alias_stage_000.js
774794197013f344e9dcaa480d7ae7004565e7b8ad3db5b6b587afd1fc4ee26a		 deobfuscated-js JavaScript hex-escape property alias normalized stage at offset 0x12B202 4620 bytes

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