Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf9d3d8d47f6479…

MALICIOUS

PDF

6.6 KB
MD5: fb4a4b5401e2176af31163b42883bb65 SHA-1: 699f8a3e4af5ca892bc9db29ad7f9f41306a3c90 SHA-256: 9bf9d3d8d47f6479e809e2cf4c0fdfa1d34530c16df67d56c94cfaa9a2a3e0e2
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream was found to contain an unescape() call, suggesting obfuscation to hide its malicious payload. While no specific URLs or further script details were extracted, the presence of obfuscated JavaScript points to an attempt to execute arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 4

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0024_00.bin
02108b9e8e196f2c9e6f7f7b84381090645631a162bf2b55e2e97b03ebeb1285		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 608 bytes

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