What is the best approach to decipher an obfuscated JavaScript file?

While browsing a site, I came across a javascript file that appears like this:

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}('h=[\'.I-l\',\'#f-m\',\'.e-d-f\',\'.e-d-q\',\'.r-1-s\',c.t,c.k];5 g(0){8(0 6 w||0 6 v){y(b a z 0){b 9=0[a];$(9).7()}}8(0 6 E){$(0).7()}}$.G.7=5(){x j.H(\'F\',\'i\').2(\'3-1\',\'4\').2(\'-D-3-1\',\'4\').2(\'-C-3-1\',\'4\').2(\'-B-3-1\',\'4\').i(\'A\',u)};p(o).n(5($){g(h)});',45,45,'elements|select|css|user|none|function|instanceof|tknDisableSelection|if|current|key|var|tknSelectors|videos|recommended|next|tknSetUnselectable|tknUnselectable|on|this|vocabContent|listings|video|ready|document|jQuery|previous|expanded|wrapper|vocabTabList|false|Object|Array|return|for|in|selectstart|ms|moz|webkit|String|unselectable|fn|attr|dialogue'.split('|'),0,{})

This script seems to be obfuscated in a common pattern, but it's not clear which one it is.

How can I decrypt and convert this code into readable javascript?

javascript

Answer №1

This task appears to have been made simple by using a tool similar to the "packer". I found that jsbeautifier is able to handle it efficiently, especially with the option called "detect packers and obfuscators":

tknUnselectable = ['.dialogue-listings', 
                  '#next-video', 
                  '.recommended-videos-next', 
                  '.recommended-videos-previous', 
                  '.expanded-select-wrapper',        
                  tknSelectors.vocabTabList,       
                  tknSelectors.vocabContent];

function tknSetUnselectable(elements) {
    if (elements instanceof Array || elements instanceof Object) {
        for (var key in elements) {
            var current = elements[key];
            $(current).tknDisableSelection()
        }
    }
    if (elements instanceof String) {
        $(elements).tknDisableSelection()
    }
}
$.fn.tknDisableSelection = function() {
    return this.attr('unselectable', 'on')
           .css('user-select', 'none')
           .css('-webkit-user-select', 'none')
           .css('-moz-user-select', 'none')
           .css('-ms-user-select', 'none')
           .on('selectstart', false)
};
jQuery(document).ready(function($) {
    tknSetUnselectable(tknUnselectable)
});

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