Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6e8213c3c17000…

MALICIOUS

PDF

45.3 KB
MD5: f434a3992975f4c5caf8686a6223f37f SHA-1: 88be1b79367350abe59ac82f8bb362c70488f42d SHA-256: 5e6e8213c3c17000b6bb1c9469ac1c44a60243f2f273186a1fb9ae99b1d46e5a
176 Risk Score

Malware Insights

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

The PDF sample contains obfuscated JavaScript, identified as an exploit cluster targeting XFA forms. This script is designed to download and execute a secondary payload, indicated by the ML classifier and ClamAV detection. The presence of JavaScript points to T1059.007, and the exploitation of a client vulnerability aligns with T1203. Given the nature of PDF exploits, T1566.001 is also relevant as a likely initial access vector.

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
afc39093ea6161e290c890ff1d653e480e80841dad40365c003f1323466635ad		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1E4 3696 bytes

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