Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9f81662a1696f1…

MALICIOUS

PDF

414.3 KB Created: 2007-02-25 14:30:32 +08:00
MD5: aab2c26013ec7c82840e3370427b4f97 SHA-1: 9e3196a15a6a94e6b52f1a9dc3d9858bbfa390b0 SHA-256: 9f9f81662a1696f12bb8830e3b9eb6f02a802458dfb36714983fbc1890e49180
246 Risk Score

Malware Insights

This PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The embedded JavaScript stream, named 'javascript_obj0090_000.js', is highly suspicious and likely responsible for downloading and executing a secondary payload. ClamAV also detected this file as 'Win.Trojan.Dropper-82', further indicating its malicious nature.

Heuristics 9

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
  • ClamAV: Win.Trojan.Dropper-82 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Dropper-82
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0090_000.js
ef01b449038df0d7df29a8120b8f44a6538eaacfc7406417b33a0c089f03fc49		 pdf-javascript-stream PDF /JS object 90 at offset 0xF80 3613 bytes
Detection
ClamAV: Win.Trojan.Dropper-82
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).

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