#target indesign 
if(app.selection.length > 0) main(); 
 
function main() { 
	app.transformPreferences.whenScaling = WhenScalingOptions.adjustScalingPercentage; 
	var gb_vorher = app.selection[0].geometricBounds; 
	var breite_vorher = gb_vorher[3] - gb_vorher[1]; 
	app.selection[0].fit(FitOptions.FRAME_TO_CONTENT); 
	var gb_nachher = app.selection[0].geometricBounds; 
	var breite_nachher = gb_nachher[3] - gb_nachher[1]; 
	var factor = breite_vorher/breite_nachher; 
	var myScaleMatrix = app.transformationMatrices.add({horizontalScaleFactor:factor, verticalScaleFactor:factor}); 
	app.selection[0].transform(CoordinateSpaces.pasteboardCoordinates, AnchorPoint.TOP_LEFT_ANCHOR, myScaleMatrix); 
	 
} 

#target indesign  
if(app.selection.length > 0) main();  
  
function main() {  
	app.transformPreferences.whenScaling = WhenScalingOptions.adjustScalingPercentage;  
	var gb_vorher = app.selection[0].geometricBounds;  
	var breite_vorher = gb_vorher[3] - gb_vorher[1];  
	var hoehe_vorher = gb_vorher[2] - gb_vorher[0];  
	app.selection[0].fit(FitOptions.FRAME_TO_CONTENT);  
	var gb_nachher = app.selection[0].geometricBounds;  
	var breite_nachher = gb_nachher[3] - gb_nachher[1];  
	var hoehe_nachher = gb_nachher[2] - gb_nachher[0];  
	var factorb = breite_vorher/breite_nachher;  
	var factorh = hoehe_vorher/hoehe_nachher;  
	var factor = Math.min( factorb, factorh); 
	var myScaleMatrix = app.transformationMatrices.add({horizontalScaleFactor:factor,  verticalScaleFactor:factor});  
	app.selection[0].transform(CoordinateSpaces.pasteboardCoordinates,  AnchorPoint.TOP_LEFT_ANCHOR, myScaleMatrix);  
	app.selection[0].geometricBounds = gb_vorher; 
}