Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d10788d897bada…

MALICIOUS

PDF

426.5 KB Created: 2010-11-29 10:29:36 Authoring application: FPDF 1.6
MD5: d26f6b954a5b265265fda28a3138d33d SHA-1: 1a3e66f162542a19bc5ac1578e8c45eef80d92a1 SHA-256: 88d10788d897badad297a4c5c33379e306e95b5d72fc5ee581c1018c01acfa12
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics, and is flagged as malicious by an ML classifier. The presence of JavaScript actions and streams suggests an attempt to execute code, likely to download and run a secondary payload. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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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