Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b284c823e86307…

MALICIOUS

PDF

6.2 KB
MD5: fbf84221dd8c48f007b659192e425b53 SHA-1: d4034e220e1ca86f4338c69a4e9bb8600ce9022a SHA-256: 98b284c823e86307225709583731c24a1d7673c185e26ea26079a3348c8e7182
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests obfuscation is being used to hide malicious code. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript likely attempts to download and execute a second-stage payload, though the specific actions are obscured. No benign URLs were found, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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_0023_00.bin
7fea363e3ba86d373b79504bdd7f2b36fce23c574f5271ebe464d2871c7db1c7		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 702 bytes

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