Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ac23301ccd78db…

MALICIOUS

PDF

49.2 KB Created: 2010-02-09 11:19:09 +01:00 Authoring application: Acrobat PDFMaker 8.1 für Excel (via Acrobat Distiller 8.1.0 (Windows))
MD5: c6076af95a985ac6c930b4038c0df5a8 SHA-1: 602780f16af31a4f7ab8df894f6fa9f89720078d SHA-256: b8ac23301ccd78dbdd6c1bfea12ee32b9a36ee268e7808cff12c243e16145c20
178 Risk Score

Malware Insights

The PDF file contains embedded JavaScript and triggers a critical heuristic for CVE-2009-0927 (Collab.getIcon). This indicates the document is designed to exploit this vulnerability to execute arbitrary code. An additional critical heuristic indicates a malicious extracted artifact, further supporting the malicious nature. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, although the specific details are obfuscated.

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. (matched in decompressed stream)
  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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/
    • http://www.iec.ch

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0018_000.js
798c7fabd4e4d9bffcf05d3f7b9b3721c83cf4024593ef545e8d0401adacf4d8		 pdf-javascript-stream PDF /JS object 18 at offset 0x11DF 4248 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).
icc_00_off000087aa.icc
00c36ad25cc79152e364edf8e9d58e9fd2807e6188c07a8de84826e22aab9a92		 pdf-icc-profile PDF ICC profile at offset 0x87AA 3144 bytes

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