Convert the ascii color code to hex

Hello
I've been confused for a few days and I can't make a logical code equation to read the existing color code.
I want to know how to convert this output to Hex color code

[Project]

We want to be able to call the names and colors code in the following address with script code

AE  => Edit  =>  Preferences  =>  Labels  =>  Label Colors

[My Code]

var Color = app.preferences.getPrefAsString("Label Preference Color Section 5", "Label Color ID 2 # 1", PREFType.PREF_Type_MACHINE_INDEPENDENT);

var NameColor = app.preferences.getPrefAsString("Label Preference Text Section 7", "Label Text ID 2 # 1", PREFType.PREF_Type_MACHINE_INDEPENDENT);

[Problem]

Color = ��
NameColor = Red

[Want !]

How Can Read Color Code whit Hex

[efforts]

var aaColor = app.preferences.getPrefAsString("Label Preference Color Section 5", "Label Color ID 2 # 1", PREFType.PREF_Type_MACHINE_INDEPENDENT);

var aaNameColor = app.preferences.getPrefAsString("Label Preference Text Section 7", "Label Text ID 2 # 1", PREFType.PREF_Type_MACHINE_INDEPENDENT);

String.prototype.hexEncode = function(){
    var hex, i;
    var result = "";
    for (i=0; i<this.length; i++) {
        hex = this.charCodeAt(i).toString(16);
        result += ("000"+hex).slice(-4);
    }
    return result
}

var aaHex = aaColor.hexEncode();

I definitely believe it's possible!
Please tell if someone knows the solution!

Tnx Alot