Malicious PDF — malware analysis report

Static analysis result for SHA-256 24640bb3b1b65029…

MALICIOUS

PDF

43.9 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: 0f25f1ac898bfc02f1c0b9a66362cc80 SHA-1: fa4d165f3578327fa1685b002dee40699fdeb159 SHA-256: 24640bb3b1b65029381901ab7f9fd36f1da2d6514bf425472d0ecf0cee2e2c48
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that is flagged as malicious by ClamAV (Js.Exploit.Shellcode-18). The critical CVE-2009-0927 heuristic indicates that the JavaScript property alias 'Collab.getIcon' is used in conjunction with metadata to extract and evaluate content, a common technique for exploiting PDF vulnerabilities. This script likely downloads and executes a second-stage payload.

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
6ed0b87c7d9346a8a156e6a4c2646e3a97837dff567ef575b5d000a36d4f2f9d		 pdf-javascript-stream PDF /JS object 27 at offset 0x73AF 10614 bytes
js_property_alias_stage_000.js
b0ca78b05bb94b4bd60b82e5eb6bdcdbb9731fe3ddca0bed235957c59b4427d0		 deobfuscated-js JavaScript property alias normalized stage at offset 0x73AF 9638 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely

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