Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e36385936651032…

MALICIOUS

PDF

195.7 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: 1c1681a8effb97d33e2ae6c205301278 SHA-1: c19e49110506ad4d00a374ca724740c99ac32f3c SHA-256: 2e36385936651032aab1998ae6417d0f232f73f012c3e8d9726bc37b1e9d3662
184 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-0927 (Collab.getIcon). This JavaScript is further identified by ClamAV as Js.Exploit.Shellcode-18. The primary function of the script appears to be downloading and executing a second-stage payload, indicated by the critical heuristic firings and the nature of the exploit.

Heuristics 7

  • 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)
  • 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
  • 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_obj0027_000.js
2066b153f6a7c9087b7988952f548b800378015f576f10414aee3eb00542c8e3		 pdf-javascript-stream PDF /JS object 27 at offset 0x2D216 11081 bytes
js_property_alias_stage_000.js
9b1fda199c34ec089925b40144626f2dae0b888e596117e576a887876b3078c8		 deobfuscated-js JavaScript property alias normalized stage at offset 0x2D216 9922 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely

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