Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b40213f092f2a29…

MALICIOUS

PDF

45.3 KB
MD5: 63ea948db1e9aca3e6e69a847d4458d2 SHA-1: e61a9ecbd7dd925c781ac1c99ebd0a3abfcdaf27 SHA-256: 0b40213f092f2a29c39eec1242eab195b824a40e24ab6fdce12e006f1e9b53e6
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, which is flagged as an exploit cluster targeting XFA forms. This JavaScript is likely designed to download and execute a secondary payload, a common technique for initial compromise. While the embedded URLs are benign, the presence of obfuscated JavaScript and the critical heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9401

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
ff6a14b520b473651c0812bfd0f1223216cddcc0106156e404748b31b516fcd3		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1E6 3813 bytes

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