Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d16de6fcf4f9c66…

MALICIOUS

PDF

6.5 KB Created: 2009-05-06 20:45:24 +08:00 Authoring application: DocuCom PDF Core Library
MD5: 100ddc4b4335b52f602cb836edcb554e SHA-1: 164421b383e90da2374deddf4f55ed34c027033d SHA-256: 3d16de6fcf4f9c6661af3b9f56ea914f87481a2f1659a743b5aab28f1f39f26c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is identified as a malicious PDF by ClamAV with the signature Pdf.Exploit.Agent-35646. Static analysis detected embedded JavaScript, indicating an attempt to exploit a vulnerability within the PDF reader. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript is likely responsible for executing arbitrary code, leading to the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
  • 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.
  • 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 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/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0004_000.js
32708c33d49728a53486bef5569020eb14a5ba8596e8dfa3e8c029f1fdc7e404		 pdf-javascript-stream PDF /JS object 4 at offset 0x891 14600 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: unlikely

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