Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d3d3077c99f025…

MALICIOUS

PDF

426.0 KB Created: 2010-11-29 10:29:36 Authoring application: FPDF 1.6
MD5: 02dc64238ccfa2c93d5c7e593a24550b SHA-1: 99e0121edd053fbd93d51706c735e279f2925dbc SHA-256: 85d3d3077c99f025f60d376a6d450ba8cd612189869b32b3e496393423f26554
74 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The presence of PDF_JAVASCRIPT and PDF_JS heuristics indicates that the script is intended to perform malicious actions, likely downloading a second-stage payload. The document body is heavily obfuscated and does not provide clear user-facing content, further suggesting a malicious intent behind the file's creation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

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