Malicious PDF — malware analysis report

Heuristics 10

• PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
  PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
• eval() call high PDF_EVAL
  eval() found — commonly used for obfuscated exploit execution
• unescape() call high PDF_UNESCAPE
  unescape() found — often used to decode shellcode in PDF JS exploits
• Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
  PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
• Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
  Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
• Suspicious extracted artifact high 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 JS stream low PDF_JS
  PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
• 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.
• 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.
• 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://community.germanwings.com/

  • http://www.germanwings.com/skysales/Boomerang.aspx?c=
  • http://www.germanwings.com/css/default_print.css
  • http://www.germanwings.com/js/default.js
  • http://blog.deconcept.com/swfobject/=0A=
  • http://www.germanwings.com/js/default_topnav.js
  • http://www.germanwings.com/skysales/Search.aspx?culture=3Dde-DE
  • https://www.germanwings.com/sc/s_code.js
  • http://www.monotype.comMonotype
  • http://www.opensource.org/licenses/mit-license.php=0A=
  • http://www.omniture.com
  • http://schemas.openxmlformats.org/drawingml/2006/main
  • http://www.w3.org/1999/02/22-rdf-syntax-ns#
  • http://ns.adobe.com/iX/1.0/
  • http://ns.adobe.com/pdf/1.3/
  • http://ns.adobe.com/xap/1.0/
  • http://purl.org/dc/elements/1.1/
  • http://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlhttp://www.monotype.com/html/type/license.html

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