You can resize your loaded animated file to stage size as follows:
loader.contentLoaderInfo.addEventListener(Event.COMPLETE,loadComplete); //Here loader is an instance of Loader to load the animated file.
loader.content.your animated content.width = 1067;
loader.content.your animated content.height = 600;
e.currentTarget.content.your animated content.width = 1067;
e.currentTarget.content.your animated content.height = 600;
//Here your animated content means, animated content should be placed on a particular movieclip which has provided by name. You can access that movieclip by
getChildByName("name") in the place of your animated content in the above code.
If you really place it on the stage and give it an instance name, the above code is working fine.
Once check with trace statement
If it is undefined means check with your file.
I have one doubt. Here your animation file means, you are trying to load an swf file which contains animation or something else?
If my guess is right (if it is swf) the above code is apt for your program.