Malicious PDF — malware analysis report

Static analysis result for SHA-256 1782c37bb3c9124f…

MALICIOUS

PDF

45.4 KB
MD5: 239dc8e61e249af89b1f9a00108bbe69 SHA-1: 33d725f57378a346b1b72d6267feb6ecb76b8d7a SHA-256: 1782c37bb3c9124f252122b954f24c8b5494f035a430e9a9603a9e277c4cff55
176 Risk Score

Malware Insights

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

This PDF sample contains embedded JavaScript, flagged as a critical exploit cluster associated with XFA forms. The JavaScript is obfuscated but its presence and the exploit cluster signal indicate it's designed to execute malicious code. The primary function appears to be downloading and executing a secondary payload, a common technique for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9615

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
f3dd37f0c9e5b9016437cc32798ff4da112e75a5983573d056c3a58fb0006c66		 pdf-javascript-stream PDF /JS object 12 at offset 0xA207 3774 bytes

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