Malicious PDF — malware analysis report

Static analysis result for SHA-256 757ab8f30794bb00…

MALICIOUS

PDF

41.0 KB
MD5: 908abe64d8802f818e2ab199804aa1c1 SHA-1: fdc678da5cbd0406033553597f69da57ebec6461 SHA-256: 757ab8f30794bb0027389304bf3561dcba9ab1244f33cf05838feeb415ae9bcb
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript and is flagged as an exploit cluster targeting XFA forms. This suggests the script is designed to execute malicious code, likely downloading a secondary payload from a remote source. The presence of the 'ML_NYX_PDF_MALICIOUS' heuristic further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.bitstream.com In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/2.6/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.6/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000033c.bin
01f6dcdbc53b835e5f3b38ba6e32776800d695ec08979fcc67ed06a8af803a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C 65932 bytes

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