Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c90c750141e091…

MALICIOUS

PDF

764.0 KB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 142233496c6bbc1904c5ebd4cc6d2f52 SHA-1: fe211efbd7b3ffbdc578f25c12eb977abc6d693d SHA-256: a3c90c750141e091c7177af61790ff5bdc97e2ba19778dede7fa2e60240c2d76
76 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits the CVE-2009-4324 vulnerability. The critical heuristic specifically mentions the 'media.newPlayer' JavaScript property alias being used in a way that suggests the PDF launcher concatenates info fields, extracts characters at a fixed stride, and evaluates the result, indicating a likely exploit chain. No other malicious URLs or scripts were identified, leading to a lower confidence in family attribution.

Heuristics 4

  • 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 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/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
8ae2b0c101457748ee3867e90b058dad3adbcbe2a705bf10655aaf2ba664bfee		 pdf-javascript-stream PDF /JS object 17 at offset 0x4DA 3005 bytes
js_property_alias_stage_000.js
fa82f6cc2dd98620750e57ba0d65f1db104d1f9e1a26a2502631f1512f093c01		 deobfuscated-js JavaScript hex-escape property alias normalized stage at offset 0x4DA 2828 bytes

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