Malicious PDF — malware analysis report

Static analysis result for SHA-256 09be524a3fde1294…

MALICIOUS

PDF

45.9 KB
MD5: a64fb825e7d57adf313cc4160e2b84d0 SHA-1: e6596913a4a876fd1b15f579332f36b7a1eb1149 SHA-256: 09be524a3fde12944060f31844b6e9967bac18651a3d57addc3974a28fc4533b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, flagged as an exploit cluster targeting XFA forms. This script is designed to download and execute a secondary payload, indicating a malicious intent to compromise the user's system. The presence of JavaScript and the exploit cluster strongly suggests a client-side execution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9376

Heuristics 6

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
aef3cf54aa39c91073727422e61d8cecb4032c6a2bfed33ffad5c259e06f7ffc		 pdf-javascript-stream PDF /JS object 12 at offset 0xA202 4255 bytes

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