Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab7bea6aa31d28e…

MALICIOUS

PDF

6.4 KB
MD5: db4ae1b4d5d506870f0928c796107a24 SHA-1: 081af5b4b64cec95e27f0f47f0ba870363ba05c7 SHA-256: 3ab7bea6aa31d28e2f8636682448b6d1954d4b6f5c6ecd0c2ff362fe8662515c
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/Shell

The PDF contains an embedded JavaScript stream that is flagged by multiple heuristics, including PDF_JAVASCRIPT and PDF_JS. The presence of an unescape() call suggests obfuscation, commonly used to hide malicious actions. The ML classifier strongly indicates maliciousness. While the specific JavaScript code is not provided, the heuristics and ML score suggest it is designed to download and execute a second-stage payload. The embedded URLs are all confirmed benign and do not appear to be directly involved in the malicious execution.

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
e7e62266bbeb4216d3ce681d7172a07ad02e7161c33182317bb6794f28469a43		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 534 bytes

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