Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53ed311697e1f02…

MALICIOUS

PDF

6.3 KB
MD5: f8556c3ec7c5b614800bd76e75278e60 SHA-1: 85692e5567b4a241d7b094c162c879e05d9f1273 SHA-256: a53ed311697e1f02d7c9307bf03fe2be2e5708a5da81a97f56963c621b8af176
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript that utilizes an eval() call, indicating an attempt to execute arbitrary code. This is a common technique for downloading and running further malicious payloads. While no specific URLs were extracted, the presence of JavaScript and the ML classifier's high confidence suggest a malicious intent. The benign URLs present are likely decoys or standard PDF metadata references.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 4

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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
89657c96dccd8284718f054c21ea03b6bab28b08d1a87cf11c4558360988b70a		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 503 bytes

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