Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5043127d82086dd…

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: 3b569172c6a919b590cea2340f3b6f44 SHA-1: b873520952987afdd3cb21d9ad383f04619ad8d0 SHA-256: f5043127d82086dd0a153a9d0ef8e5c816b7381639cc9502a0e1c0f37057d040
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability (media.newPlayer). This vulnerability allows for the execution of arbitrary JavaScript, which is then used to concatenate and evaluate obfuscated code. The embedded JavaScript is designed to exploit this flaw, likely to download and execute a secondary payload. The specific nature of the payload is not discernible from the provided evidence, but the exploitation of a known PDF vulnerability points to a malicious intent.

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
130ef6146b2bc36b7b4970799ea01e2e019a820420c6eec104da3a42db5481f8		 pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 3494 bytes
js_property_alias_stage_000.js
30b02e33f6d477451fe05a15e0c257e978dcb9b43f2fb43f673464774bf8f43e		 deobfuscated-js JavaScript hex-escape property alias normalized stage at offset 0x12B202 3347 bytes

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