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 _HZ="7d15563d3c73e2780d41543a3855b87e9a8db07e0910e32c574bb82c70257624173536323964623231613435373638342b5fb07e5d10016939603866702576247074777389e7f2a2da778d00363638bf0d42b9c3b90e88123fc80cd69b86cda6d9d0c9cdc63dde8381d1da046bda8984895f6709c6905cb9dde55381d087d486d2d6d5d1dc8781ea85d08485d2d0dbece6b88084e1f5a3bae480e058cfda6b3dc9858682d93cae8281d17b55044280ecc639cf81d968bdd689d477060414f2c2ebd1df7123bca07c32c76c98878688d461878084897f0185e32ae05 …

• 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 _HZ="7d15563d3c73e2780d41543a3855b87e9a8db07e0910e32c574bb82c70257624173536323964623231613435373638342b5fb07e5d10016939603866702576247074777389e7f2a2da778d00363638bf0d42b9c3b90e88123fc80cd69b86cda6d9d0c9cdc63dde8381d1da046bda8984895f6709c6905cb9dde55381d087d486d2d6d5d1dc8781ea85d08485d2d0dbece6b88084e1f5a3bae480e058cfda6b3dc9858682d93cae8281d17b55044280ecc639cf81d968bdd689d477060414f2c2ebd1df7123bca07c32c76c98878688d461878084897f0185e32ae05 …

• 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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