Malicious PDF — malware analysis report

Static analysis result for SHA-256 43978845d48fae54…

MALICIOUS

PDF

134.2 KB
MD5: abb3d1be96ec9b95b10b1561fdff1090 SHA-1: e60679a7370171b98791afa4583cec5539ec7dc3 SHA-256: 43978845d48fae54280ed7fcb1f8657c8dda68a211918752fdde5b9f7f85a1d1
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The file is a PDF containing embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. ClamAV also flagged it as 'Heuristics.PDF.ObfuscatedNameObject'. The embedded JavaScript is likely used to download and execute a second-stage payload. The document body is heavily obfuscated and unreadable, providing no contextual clues. The extracted URLs are related to XFA forms, which are known to be exploited in PDF-based attacks.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3882

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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
854e0e6f3a92c712ff0d40b20f05dc1e499087ab20c05e4aa3fdb17aeef07804		 pdf-javascript-stream PDF /JS object 12 at offset 0x20DE4 4843 bytes

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