Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b03be92e98bf95…

MALICIOUS

PDF

44.3 KB
MD5: 84973df13489b5b9774adca18d8f0880 SHA-1: 1d6b861ab636fd368010e1605d9e674c70b9a179 SHA-256: 63b03be92e98bf95125c1065454c6eecaf0aaf92a8178d43594a9f4ad8a7290c
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 as part of an exploit cluster targeting XFA forms. This script is designed to download and execute a second-stage payload, indicated by the critical heuristic firings. While the specific family is not identifiable, the attack pattern strongly suggests a malicious document used for initial compromise via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
e7e935349ab4b782fdf7755d06c67947a948e6f04dd8773723f6e8e70885deab		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1DD 2713 bytes

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