Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78628c77ae7e5dc…

MALICIOUS

PDF

27.5 KB Created: 2009-09-17 09:09:59 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 57677417bcebec055631ca7d163e1b6c SHA-1: 31abb04ba9abdcaa003add4e2a18ebeb318a0203 SHA-256: a78628c77ae7e5dc339d3abbf45dc68748a63ac74a04d6413b68032e8e15616e
78 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2009-0927 vulnerability (Collab.getIcon). The critical heuristic indicates that the JavaScript is obfuscated and designed to be evaluated after being constructed from document information fields. This technique is commonly used to download and execute further malicious content. No specific family could be identified, but the attack pattern is consistent with PDF-based exploit delivery.

Heuristics 5

  • 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)
  • 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.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
7fdcd4eb198a07b4a7094daf62b0d480a92c2fa13481746c1f34a8c50ad18e4d		 pdf-javascript-stream PDF /JS object 17 at offset 0x4DA 2889 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
js_property_alias_stage_000.js
3bd334f05699cfc02554ebdf4a1f5438658f7b4809930685862f3acf8350be6d		 deobfuscated-js JavaScript hex-escape property alias normalized stage at offset 0x4DA 2535 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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