Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c339aeea4a139d…

MALICIOUS

PDF

45.4 KB
MD5: 32ab59f5142c7f511fd2c9d5ed662764 SHA-1: aab25a46a8645f04bdfff8905a6c72f76df60281 SHA-256: 13c339aeea4a139d8ffd26caf66cdddd50a627236c43fe1d5bd4b468a6576e92
176 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript, flagged as a PDF JavaScript exploit cluster and obfuscated name object by ClamAV. The JavaScript code, though obfuscated, is designed to exploit vulnerabilities within the PDF reader, likely to download and execute a secondary payload. The presence of XFA form elements further supports the exploit vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9595

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
a7e4c5fbfe592258492bca98fe732f9842dda66b5f37c3b9457acfe83a381f80		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1F9 3864 bytes

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