Malicious PDF — malware analysis report

Static analysis result for SHA-256 75881c6b02284fb7…

MALICIOUS

PDF

123.3 KB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 4043c1ca174c1c66d41a767a48b93fe0 SHA-1: a152e94504b1a3dda6dd3261168bb01749f56322 SHA-256: 75881c6b02284fb74219861116dc8180a9458836bdde95d8c6294015e8c4e5c1
148 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, which is flagged as a high-severity heuristic for generic exploit stage recovery. The critical heuristic CVE_2009_4324 indicates exploitation of a known vulnerability related to media player functionality. The JavaScript code is heavily obfuscated but appears to be designed to download and execute a secondary payload, a common technique for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
e09c11a234f64adaffab57715b8092ca8ba50bababda482d288dbb68b8e2db9b		 pdf-javascript-stream PDF /JS object 17 at offset 0x4DA 3452 bytes
generic_stage_recovery_000.js
4b1f222cd78ec223727c7b70ca67579748d72180fd719deffcbf0d75005e04fb		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 17 at offset 0x4DA 3240 bytes

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