Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ed49b7ff90578b…

MALICIOUS

PDF

151.0 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: 2368f479141431b39f272094ae33ce2b SHA-1: 838d471927837feec4b374fd1953ed5dfb0d6dbd SHA-256: e9ed49b7ff90578bdba7c850ce533f4460c1466ec47ba2d71b41f57126e3a080
126 Risk Score

Malware Insights

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

The sample is a PDF file that contains embedded JavaScript, which is used to exploit CVE-2009-0927. The exploit involves the `Collab.getIcon` JavaScript property alias, which is normalized and used to construct a string that is then evaluated. This process likely leads to the download and execution of a second-stage payload. The PDF also contains embedded files and RichMedia (Flash), further indicating malicious intent.

Heuristics 6

  • 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)
  • 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
2f40f410cfbd3488aa949d8e556bcf749765729555df916a4b75beb3fa3f4302		 pdf-javascript-stream PDF /JS object 27 at offset 0x22024 10896 bytes
js_property_alias_stage_000.js
65b3997f35a91db339cf78bf0c206b15104f54324347ea1bf0a82b4b70228df2		 deobfuscated-js JavaScript property alias normalized stage at offset 0x22024 9749 bytes

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