Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf63d6459c7420c7…

MALICIOUS

PDF

417.7 KB Created: 2007-02-25 14:30:32 +08:00
MD5: 9e7caa1258a4bc0c9745c3b9c842b86a SHA-1: ef559f78cb26f594c88d388565c47e9b81170d79 SHA-256: cf63d6459c7420c7d313e27efa25c0b13b2ba6c015ecb7f9feb3488913dbec61
246 Risk Score

Malware Insights

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

The sample is a PDF file that contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. A critical finding is the CVE-2007-5659 exploit targeting the Collab.collectEmailInfo method, which is known to be used for arbitrary code execution. The embedded JavaScript stream, named 'javascript_obj0077_000.js', is likely responsible for downloading and executing a secondary payload, as suggested by the ClamAV detection of 'Win.Dropper.Agent-34536' on both the main file and the extracted artifact. The presence of benign URLs does not detract from the malicious nature indicated by the exploit and dropper signature.

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.Dropper.Agent-34536 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Agent-34536
  • 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_obj0077_000.js
d0e67dd7ea2173fb71cb9c78e2529cae771ba5fd825e748382551ada286e5d7c		 pdf-javascript-stream PDF /JS object 77 at offset 0x67445 3677 bytes
Detection
ClamAV: Win.Dropper.Agent-34536
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).

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