Malicious PDF — malware analysis report

Heuristics 10

• Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
  PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
• 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.
• 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 inside decoded stream)
  Matched line in script

       <script contentType="application/x-javascript">var _BS="7a19063a6027b3735a46053b6a06b372c2d9b12e0013b4725c19e12b7622247510396635653033396666653465653338730bb12e54135637323261617622247577782774d5b3a3a98d70dc01646533b35516b893b00ddf4c349a55d19d819ff7dedc99ca9a698f88d6d68b0539898288d10b6659cf930be7d6b70a86d68086d7d5da85d680d3d0e1d2d7d5848083d0e0beec81d4e8f6f4e4efd2b95fc9dd396cce89d6858568ff89d6d62a5456118be09e6dced1d06bea8882862e010213a093ecdd8f767fe8f17765c03d99d5d583d839d381d4807c56dbe878b95 …

• Embedded script payload in PDF stream medium 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 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
• String.fromCharCode low PDF_FROMCHARCODE
  String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  Matched line in script

       <script contentType="application/x-javascript">var _BS="7a19063a6027b3735a46053b6a06b372c2d9b12e0013b4725c19e12b7622247510396635653033396666653465653338730bb12e54135637323261617622247577782774d5b3a3a98d70dc01646533b35516b893b00ddf4c349a55d19d819ff7dedc99ca9a698f88d6d68b0539898288d10b6659cf930be7d6b70a86d68086d7d5da85d680d3d0e1d2d7d5848083d0e0beec81d4e8f6f4e4efd2b95fc9dd396cce89d6858568ff89d6d62a5456118be09e6dced1d06bea8882862e010213a093ecdd8f767fe8f17765c03d99d5d583d839d381d4807c56dbe878b95 …

• 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://www.xfa.org/schema/xfa-template/2.5/ In PDF document text

  • 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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