Malicious PDF — malware analysis report

Static analysis result for SHA-256 1358380c978a05ab…

MALICIOUS

PDF

388.0 KB Created: 2010-06-05 21:09:12 +08:00
MD5: dc679ceb9a6e5bb5a17c7be75c0d8eaf SHA-1: a2e5cb17ffe764c23f6edca41ed2675565151060 SHA-256: 1358380c978a05ab35663be1b2d87ba3748ea249565bb3d385eedd7285715da5
316 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary code. The presence of a dropper heuristic and the embedded URL pointing to a Windows executable suggests the file is designed to download and run a secondary payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9420

Heuristics 9

  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • /Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target — references a known-dangerous executable (cmd, PowerShell, etc.).
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • /Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS
    PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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.ah.com
    • 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/AcrobatAdhocWorkflow/1.0/
    • http://the.earth.li/~sgtatham/putty/latest/x86/putty.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000078b.js
8b90287adbb700226d6d4b70cc31747f2bae076eb1eeb890d07ec5559264fe56		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x78B 3360 bytes

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