Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e53d95a3d81d545…

MALICIOUS

PDF

230.0 KB Created: 2010-01-07 11:07:02 +08:00
MD5: 6352204273f1397e057d1b8209199d43 SHA-1: 0f9bb525862177b2e623d6fbff03183ac3cb02fb SHA-256: 2e53d95a3d81d54598acbcffef1a873fecee084d3033aaecf8fb0e13127feffa
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript and is flagged for exploiting CVE-2009-4324 via the media.newPlayer function. This indicates the document is designed to leverage a known vulnerability in PDF readers to execute arbitrary code. The embedded JavaScript, though not fully detailed here, is the likely mechanism for delivering a secondary payload, as suggested by the 'PDF_EMBEDDED' and 'PDF_JAVASCRIPT' heuristics.

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)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x674 126 bytes
objstm_0026_00.bin
1927301306a8a9b7ed09f153bcb6dbe394efd284902831ca549fbd446c3a8d21		 pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 306 bytes

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