Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7afd5ddda00a9d7…

MALICIOUS

PDF

92.2 KB Created: 2008-11-21 14:58:09 UTC Authoring application: Acrobat Web Capture 6.0 版
MD5: afc502b3893f401b68b6cd357847d0bf SHA-1: 53e17e1a6d810eb08e01d7ba1cf11370c84f8620 SHA-256: e7afd5ddda00a9d7721cbbe944bdc7ef141f2baf74a6fe8db43c75c576313ef3
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 Html.Trojan.Agent-35518. A critical heuristic indicated the presence of embedded JavaScript, and an extracted artifact was also detected by ClamAV as Js.Exploit.Shellcode-18. This suggests the JavaScript is responsible for downloading and executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Html.Trojan.Agent-35518 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Html.Trojan.Agent-35518
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0033_000.js
73603d35ca9f2244fac73505ab133d3d1d2afee6faebe821bb9424f6bf2e4b23		 pdf-javascript-stream PDF /JS object 33 at offset 0xA4D 16192 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely

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