Malicious PDF — malware analysis report

Heuristics 6

• XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
  PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
• eval() call high PDF_EVAL
  eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  Matched line in script

              var yo = eval(ezJ.rk[0] + ezJ.rk[1]);

• Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
  One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
• XFA form low PDF_XFA
  PDF uses XML Forms Architecture — can contain script logic (matched inside decoded stream)
• Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
  PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
• 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://ns.adobe.com/xdp/ In PDF document text

  • http://www.xfa.org/schema/xfa-template/3.1/In PDF document text
  • http://www.xfa.org/schema/xfa-template/3.0/In PDF document text

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