Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc55857276d3aa4…

MALICIOUS

PDF

134.8 KB Created: 2011-04-19 14:23:41 +08:00 Authoring application: Acrobat PDFMaker 9.0 Word 版 (via Acrobat Distiller 9.0.0 (Windows))
MD5: 3173d2a0a607eccf21707a3dc5de30da SHA-1: b18de396e6392e9e241e816e662e8f5abdb68a99 SHA-256: 7cc55857276d3aa4f16a3ee3ad100b2f58eb9c8c5f198d0c40d5dc7f2d3ea906
306 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript that exploits CVE-2009-0927 (Collab.getIcon) to launch a secondary stage. This stage is responsible for downloading and executing a Windows executable payload, identified by ClamAV as Win.Trojan.Zapchast-3780. The embedded executable and JavaScript files are the primary indicators of malicious activity.

Heuristics 10

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • ClamAV: Win.Trojan.Zapchast-3780 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Zapchast-3780
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0027_000.js
c61c75240e452b771ab3b9181c4d90410172f161e2621065860b36c1bc0f5b31		 pdf-javascript-stream PDF /JS object 27 at offset 0x1DDC7 11871 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
embedded_pdf_00000381.exe
5dcfd486260c6266afadd68eb8fedb46356e70635f18aa39be993006d0460b4c		 embedded-pe PDF raw stream PE payload at offset 0x381 114932 bytes
Detection
ClamAV: Win.Trojan.Zapchast-3780
Obfuscation or payload: likely
Carved artifact entropy is 7.62, consistent with packed or encrypted content.
js_property_alias_stage_000.js
3e27263f39528a687109f31ecae3a35382695299684b96c2f68418d25a849c2b		 deobfuscated-js JavaScript property alias normalized stage at offset 0x1DDC7 10751 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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