Malicious PDF — malware analysis report

Static analysis result for SHA-256 1218739b69450b6d…

MALICIOUS

PDF

1.95 MB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 424d498517681f8969736577683d3a6c SHA-1: c09890462bc96868d79778a74d083979dedf0eae SHA-256: 1218739b69450b6dd6ae9b1ecdc18261ace6885b4ff9e9556035acb6e8c1bdd4
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is flagged as a generic exploit stage. The critical heuristic firing for CVE-2009_4324 (media.newPlayer) indicates a known vulnerability exploitation. The JavaScript code itself is heavily obfuscated but appears to be designed to download and execute a secondary payload, as suggested by the 'generic stage recovery' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
8ae2b0c101457748ee3867e90b058dad3adbcbe2a705bf10655aaf2ba664bfee		 pdf-javascript-stream PDF /JS object 17 at offset 0x4DA 3005 bytes
generic_stage_recovery_000.js
2c4a665a4deb66f34492bfbba2277c48d49b6a19900d52a21580826c1da2480d		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 17 at offset 0x4DA 2841 bytes

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