Malicious PDF — malware analysis report

Static analysis result for SHA-256 728b9a6b955d91dc…

MALICIOUS

PDF

72.7 KB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 6dc13ad09551ab75cd79217c9e03f6d6 SHA-1: 162cbc97a6e60ebfac98cfcfa8f7b9e86669c4bf SHA-256: 728b9a6b955d91dc1c1364e994dbafa80fa1de7e69e1219072c5801131254d10
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits the CVE-2009-4324 vulnerability related to media player handling. The recovered JavaScript code is heavily obfuscated but indicates an attempt to download and execute a secondary payload, a common technique for malware delivery. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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. (matched in decompressed stream)
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • 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
f84736c2ad6b55a2cd19591a17b8698db9d6c8aa54560e0a6c7a7272c028dbc8		 pdf-javascript-stream PDF /JS object 17 at offset 0x4DD 2948 bytes
generic_stage_recovery_000.js
e54b5b28939dc50b4e8c99a4701c3c8c92afdb921b3c241ff17fb5204ddd3436		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 17 at offset 0x4DD 2784 bytes

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