Malicious PDF — malware analysis report

Heuristics 10

• XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
  PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
• ClamAV: Win.Exploit.JS-296 critical CLAMAV_DETECTION
  ClamAV detected this file as malware: Win.Exploit.JS-296
• 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.
• unescape() call high PDF_UNESCAPE
  unescape() found — often used to decode shellcode in PDF JS exploits
  Matched line in script

  <template xmlns="http://www.xfa.org/schema/xfa-template/2.5/"><subform layout="tb" locale="en_US" name="haj"><pageSet><pageArea id="are" name="are"><contentArea h="756pt" w="576pt" x="0.25in" y="0.25in"/><medium long="792pt" short="612pt" stock="default"/></pageArea></pageSet><subform h="756pt" w="576pt" name="nae"><field h="65mm" name="caw" w="85mm" x="53.6501mm" y="88.6499mm"><event activity="initialize" name="kif"><script contentType="application/x-javascript">pud=0.001;pud+=0.0709;pea=true;j …

• PDF exploit shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
  Decoded PDF exploit shellcode contains a hardcoded http(s) URL — stored as little-endian %uXXXX Unicode escapes, or hex-encoded in a document metadata field (/CreationDate, /Title) and referenced from the decoded script. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
• Embedded file low PDF_EMBEDDED
  PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
• XFA form low PDF_XFA
  PDF uses XML Forms Architecture — can contain script logic
• 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.
• Suspicious extracted artifact info 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.
• 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://vianmhdvgdw.com/nte/prox.exe/yH20352aafV0100f060006R887b9b72102T6d105352203l000c329 Referenced by PDF JavaScript

  • http://www.xfa.org/schema/xfa-template/2.5/Referenced by PDF JavaScript
  • http://ns.adobe.com/xdp/In PDF document text
  • http://www.xfa.org/schema/xci/1.0/In PDF document text
  • http://ns.adobe.com/xtd/In PDF document text
  • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
  • http://ns.adobe.com/xfdf/In PDF document text
  • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

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