Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83f09b8531b6a92…

MALICIOUS

PDF

4.7 KB Created: 2002-03-27 12:02:13 Authoring application: Aladdin Ghostscript 5.10
MD5: 9a6959c58c8af740651ac88095cdbdd6 SHA-1: f753c3e6aae9aca750d022a4dea14dbbc83736ed SHA-256: e83f09b8531b6a92db94fe17d6f0e509bc55f403df2c9200ea8d0a5584469654
238 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204 User Execution

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This script is designed to download and execute a secondary payload, as indicated by the ClamAV detection of 'Pdf.Dropper.Agent-1823682' and the suspicious extracted JavaScript file. The extracted artifact was also flagged by ClamAV as 'Win.Trojan.Agent-36171', further supporting its malicious nature.

Heuristics 7

  • 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: Pdf.Dropper.Agent-1823682 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1823682
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
e0ba3499ea434101618bc91e9e0e8f8ef74787c8220b5cd7761eaeb66e9f0a99		 pdf-javascript-stream PDF /JS object 12 at offset 0xCDF 1688 bytes
Detection
ClamAV: Win.Trojan.Agent-36171
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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