Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b0f31f8112f838…

MALICIOUS

PDF

6.0 KB
MD5: fb3f6f3d67a341368d6b23c812375146 SHA-1: bcbb69f06d02659f62286098ea1860812e9059dd SHA-256: f3b0f31f8112f838d983343c955fc473f5bb51ccef9ec03a4facef1f3dbd86f8
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests that the JavaScript is being executed, likely to download and run a second-stage payload. The ML classifier also flagged the PDF as malicious with high confidence. No specific family could be identified, and the embedded URLs were confirmed as benign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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_0023_00.bin
20da1ba763e2fffbcd18bdb93561c6b6db9a41053efc585cd7a1a9d71450ab92		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 341 bytes

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