Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16d4301baa42566…

MALICIOUS

PDF

225.3 KB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 5fb2242f389eb0ad3cb337fc19d00ab0 SHA-1: da75277a21c9f1467605372f8a8292c2dccf4060 SHA-256: e16d4301baa425667b98a704c0c6f012301582db2bce2ce3907dfe3d17b5d33e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: JavaScript T1059.007 Command and Scripting Interpreter: JavaScript

The sample is a PDF file that contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2009_4324 heuristic indicates that the JavaScript is designed to exploit a known vulnerability in PDF readers. This script is responsible for loading and executing a secondary embedded PDF, which itself contains suspicious static findings. The overall attack pattern involves leveraging this exploit to deliver a malicious payload.

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)
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
fec02ac84241a606ddee84042d46f183d5a3e8bc4f3fce27d6a568b328437545		 pdf-javascript-stream PDF /JS object 17 at offset 0x4DD 2944 bytes
js_property_alias_stage_000.js
0a0704461fa8203c43232880ecb4cca3a34501dc5b509982d7b0a154ee6ce5a0		 deobfuscated-js JavaScript hex-escape property alias normalized stage at offset 0x4DD 2821 bytes
polyglot_child_pdf_off000016c0.pdf
4d8e5e1b8f67384e30cd9274648c1135a95b85eae6c9ad29b5af95d0fe5a6fbc		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x16C0 224924 bytes
polyglot_child_pdf_off00002d80.pdf
4218148818665b7a3df7cfb242c1d73d23f7b1244c6c5d43dda5c40ce7002066		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2D80 219100 bytes

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