Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7de555f3511c3d6…

MALICIOUS

PDF

6.5 KB Created: 2009-05-06 20:45:24 +08:00 Authoring application: DocuCom PDF Core Library
MD5: 0eac44d66c34c9fbf4a3780ad01903f7 SHA-1: 0b740c0bb0bedaa2366891ca4e61993088c5099b SHA-256: f7de555f3511c3d6a206ea19e47e0f31d06371749f6859f66406712f6d938c4e
166 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple engines, including ClamAV which identified it as 'Pdf.Dropper.Agent-7325527-0'. Static analysis revealed embedded JavaScript, indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. This JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'EXTRACTED_FILE_CLAMAV' detection pointing to an exploit artifact. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7325527-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7325527-0
  • 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
f576cdf99d05bad16dff787d899dd46e5d7c10632cc8363b9727ea5876d1387d		 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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