Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b22082923a698a…

MALICIOUS

PDF

4.9 KB Created: 3564-48-33 77:35:65 -28:24 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: be9bdc74993da47cb56014a8e561d4dd SHA-1: 54f82f0375c23245d4f27a0219a7c047870941ad SHA-256: 20b22082923a698a4719ce47c69a407e71779d63864d03b0189c6042211aa80c
238 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 JavaScript

The file is a PDF document that contains embedded JavaScript, which is obfuscated and utilizes the unescape() function. Critical heuristics indicate the exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, a known vulnerability in older Adobe Reader versions. ClamAV also detected this file as Pdf.Exploit.Agent-36306. The embedded JavaScript is likely responsible for executing the exploit payload.

Heuristics 8

  • 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.Exploit.Agent-36306 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36306
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0028_000.js
d692d1753bf71e4a426b1d057ce9ea8f24bd40782c7bcc5a405e09213f638c36		 pdf-javascript-stream PDF /JS object 28 at offset 0x55A 2119 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36306
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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