Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6f71ddd5b895ee…

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: 0c304275913878995577f78106d59685 SHA-1: 71fac93f3c3cec15db79ca633689dde599ffdc0e SHA-256: 3a6f71ddd5b895ee6561e9514cccfdcef3489da063deaff44c9e2cb23f45f9a0
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 identified the use of 'media.newPlayer' which is associated with CVE-2009-4324, a known vulnerability. This exploit likely leverages the embedded JavaScript to download and execute a second-stage payload.

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
6387e9bd93578c6d8ee5aa901194ea1d61a2d5a328d46d56cfc15e1401e57c50		 pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 4867 bytes
js_property_alias_stage_000.js
1fb8fef9b5914692642b0b5ec5ad8df3ed2ce7db3dfcb2cd7d7b85fdb94e5dcd		 deobfuscated-js JavaScript hex-escape property alias normalized stage at offset 0x12B202 4636 bytes

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