Malicious PDF — malware analysis report

Static analysis result for SHA-256 139bc0cfc2a16fde…

MALICIOUS

PDF

44.9 KB
MD5: 4ac9842a5de14a548b7654f24455028a SHA-1: 72306590a729e20ec8593150e739208f92b1f545 SHA-256: 139bc0cfc2a16fdebbfcd2998aa1cfaa3b065fea954eed65ba9b9f577dbe36bf
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, identified as an exploit cluster targeting XFA forms. The JavaScript code is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of XFA and JavaScript points to a common exploit delivery mechanism for PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
efeac9bc51fa193f9892f372a4e8e33458a4d0a5227d3528376b7a199098287d		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1E3 3310 bytes

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