Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d0e387ff4e226a…

MALICIOUS

PDF

45.0 KB
MD5: ada3eb62563ff16401c93b01c46186a2 SHA-1: 6b93cede10852ea2c0fd7a107068c32b7e086570 SHA-256: 66d0e387ff4e226a1a4eb1ea39b3fb5ff6414c958f1eb56148a94455d129c133
176 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, identified by multiple heuristics as malicious and part of an exploit cluster. The JavaScript is obfuscated but likely attempts to download and execute a second-stage payload, a common technique for initial compromise. The presence of XFA form elements further supports the exploitation vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

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
e02cefbb58922a9ad4de5578b09c68f3782634391517eb7356b839e1fdfeb237		 pdf-javascript-stream PDF /JS object 12 at offset 0xA200 3481 bytes

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