unfortunately AS3 does not support direct communication with AS1 content. So you need to create a AS1 player which can be loaded into as3 project. Now write code in the player with local connection to communicate with as3 - as1. Now the as3 will use the local connection to call the functions inside the as1 player . the functions inside the player will do the loading of as1 content and controlling , play , pause etc.

write this code to create local connection in as3

// ActionScript 3
// local connection to communicate to AVM1 player
var AVM_lc:LocalConnection = new LocalConnection();

// loader loads AVM1 player
var loader:Loader = new Loader();
loader.load(new URLRequest("player.swf"));
addChild(loader);

// call this function on as3 button to stop animation
function stopMovie(event:MouseEvent):void {
	// ask player to stop loaded animation
	AVM_lc.send("AVM2toAVM1", "stopAnimation");
}

code in player swf, I just created a function to stop movie, you can write the functions to load, play also

// local connection in player to receive events from as3
var AVM_lc:LocalConnection = new LocalConnection();

// stopAnimation event handler , called from as3, sim ilarly write functions for loading swf , or pausing swf
AVM_lc.stopAnimation = function(){
//loaded animation in this player	
animation_movie.stop();
}

// connect the local connection "AVM2toAVM1"
// remember the name "AVM2toAVM1" should be unique on a computer so only one swf of this can work on same system
AVM_lc.connect("AVM2toAVM1");