How To Unpack Eval Function Javascript

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April 14, 2019

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Evel Functions Codings 

Eval() is function available for javascript php and other language the main idea of eval() is to evaluate and execute string as a code what this mean that you can write your javascript code as a text and you can evaluate it as javascript code this function still used in javascript but in php it's not recommended because it's unsecured function.

Eval() how it works

As we said that eval() is evaluating function that combine text and variable and try to execute them, example
var x = 10;
var y = 20;
var result = eval("x * y");
the result here will be 200 as you see the "x * y" is string but eval("x * y") it because operation.

Use eval() function to encrypting

As you see eval() not an encryption function, but most designer use eval() inside eval inside eval() ... and make their code look like encrypted.

How to unpack eval()

The easiest way to unpack eval() is to trace the return value of the function or trace the variable before get modified inside the script.

Example for eval() function

This following code result is alert("hello");

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}('A(o(p,a,c,k,e,d){e=o(c){q c.u(C)};s(!\'\'.t(/^/,x)){r(c--){d[c.u(a)]=k[c]||c.u(a)}k=[o(e){q d[e]}];e=o(){q\'\\\\w+\'};c=1};r(c--){s(k[c]){p=p.t(z B(\'\\\\b\'+e(c)+\'\\\\b\',\'g\'),k[c])}}q p}(\'j(3(4,a,c,k,e,d){e=3(c){5 c};6(!\\\'\\\'.8(/^/,i)){7(c--){d[c]=k[c]||c}k=[3(e){5 d[e]}];e=3(){5\\\'\\\\\\\\9+\\\'};c=1};7(c--){6(k[c]){4=4.8(m f(\\\'\\\\\\\\b\\\'+e(c)+\\\'\\\\\\\\b\\\',\\\'g\\\'),k[c])}}5 4}(\\\'0("1");\\\',2,2,\\\'n|l\\\'.h(\\\'|\\\'),0,{}))\',v,v,\'|||o|p|q|s|r|t|w||||||B||y|x|A||E|z|D\'.y(\'|\'),0,{}))',41,41,'||||||||||||||||||||||||function||return|while|if|replace|toString|24||String|split|new|eval|RegExp|36|alert|hello'.split('|'),0,{}))

Download javascript eval() unpacker

To download js unpacker check link below:

https://www.mediafire.com/file/3b3y4ntsm3cer08/unpacker.zip