[SCRIPTING] Open PDF as image (not showing dialog)

If it a Acrobat PDF I would think the first page only would open as a document.  At one time I wrote a Script to open an Actobat PFF and stack all the PDF pages in a document.  OpenPDFpages.jsx

/* ==========================================================
// 2017  John J. McAssey (JJMack) 
// Stack the open Document Visible layer composite into a new 300 DPI document
// This script is supplied as is. It is provided as freeware. 
// The author accepts no liability for any problems arising from its use.
// ======================================================= */
// enable double-clicking from Mac Finder or Windows Explorer
#target photoshop // this command only works in Photoshop CS2 and higher
// bring application forward for double-click events
app.bringToFront();

if (documents.length >= 2) { 
	app.togglePalettes();											// toggle off palettes so Photoshop will not need to update them
	stackpages();												    // Photosho document can be different when oneo via UI
}
else {
	var theFile = File.openDialog("Select your PDF file", "Select:*.pdf");  
	app.displayDialogs = DialogModes.NO;  
	var check = true;  
	var page = 1;  
	// define pdfopenoptions;  
	var pdfOpenOpts = new PDFOpenOptions;  
	pdfOpenOpts.antiAlias = true;  
	pdfOpenOpts.bitsPerChannel = BitsPerChannelType.EIGHT;  
	pdfOpenOpts.cropPage = CropToType.MEDIABOX;  
	pdfOpenOpts.mode = OpenDocumentMode.RGB;  
	pdfOpenOpts.resolution = 300;  
	pdfOpenOpts.suppressWarnings = true;  
	pdfOpenOpts.usePageNumber  = true;  
	app.togglePalettes();											// toggle off palettes so Photoshop will not need to update them
	while (check == true) {  
		try {  
			pdfOpenOpts.page = page;								// open a page at it slower the using Photoshop UI ans selection all the pages you want  
			var thePdf = app.open(theFile, pdfOpenOpts);  
			page++;  
		} 
		catch (e) { check =  false };  
	}; 

	if (documents.length >= 2) { stackpages(); }
	else {
		app.togglePalettes();										// toggle on palettes
		alert("multiple Document are not open in Photoshop");
	}
}	
///////////////////////////////////////////////////////////////////////////////
//                     stack pages function                                  //
///////////////////////////////////////////////////////////////////////////////
function stackpages() {
	var orig_ruler_units = app.preferences.rulerUnits;
	var orig_display_dialogs = app.displayDialogs;
	app.preferences.rulerUnits = Units.PIXELS;						// set the ruler units to PIXELS
	app.displayDialogs = DialogModes.NO;							// Set Dialogs off
	//newFile = theFile.name.substr(0,theFile.name.indexOf(".pdf"));	//New File name
	newFile = app.activeDocument.name.substr(0,app.activeDocument.name.lastIndexOf("-"));	//New File name
	var doc = app.documents.add(app.activeDocument.width.value, app.activeDocument.height.value, app.activeDocument.resolution, newFile, NewDocumentMode.RGB, DocumentFill.TRANSPARENT ); // create a new document
	//for (var i=0;i<documents.length-1;i++) {						// stack a layer for the open document into the new document page 1 on botton	
	for (var i=documents.length-2;i>-1;i--) {						// stack a layer for the open document into the new document page 1 on top
		app.activeDocument = documents[i];							// switch active document
		var layerName = app.activeDocument.name;					// get document name
		app.activeDocument.flatten();								// Flatten remove transparency
		var idDplc = charIDToTypeID( "Dplc" );
		var desc259 = new ActionDescriptor();
		var idnull = charIDToTypeID( "null" );
        var ref24 = new ActionReference();
        var idLyr = charIDToTypeID( "Lyr " );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref24.putEnumerated( idLyr, idOrdn, idTrgt );
		desc259.putReference( idnull, ref24 );
		var idT = charIDToTypeID( "T   " );
        var ref25 = new ActionReference();
        var idDcmn = charIDToTypeID( "Dcmn" );
        ref25.putName( idDcmn, documents[documents.length-1].name );
		desc259.putReference( idT, ref25 );
		var idNm = charIDToTypeID( "Nm  " );
		desc259.putString( idNm, layerName );
		var idVrsn = charIDToTypeID( "Vrsn" );
		desc259.putInteger( idVrsn, 5 );
		executeAction( idDplc, desc259, DialogModes.NO );			// Copy Layer to document
		app.activeDocument = documents[documents.length-1];			// switch to newly created document
		layerName = layerName.substr(0,layerName.indexOf(".pdf")); 
		app.activeDocument.activeLayer.name=layerName;				// label layer with Document name
	}
	app.activeDocument = documents[documents.length-1];				// switch to newly created document
	var layers = activeDocument.layers;								// get layers
	activeDocument.activeLayer = layers[layers.length-1]			// Target Bottom Layer
	activeDocument.activeLayer.remove();							// Remove original layer
	while  (documents.length>1) {									// close all opened document except the newly created document							
		app.activeDocument = documents[0];		
		activeDocument.close(SaveOptions.DONOTSAVECHANGES);
	}
	app.togglePalettes();											// toggle user's palettes back on	
	app.runMenuItem(charIDToTypeID(("FtOn")));						// fit the document to the screen 
	app.displayDialogs = orig_display_dialogs;						// Reset display dialogs 
	app.preferences.rulerUnits = orig_ruler_units;					// reset units to original settings
}
///////////////////////////////////////////////////////////////////////////////
//                stack open pages function                                  //
///////////////////////////////////////////////////////////////////////////////
function stackopenpages() {
	var orig_ruler_units = app.preferences.rulerUnits;
	var orig_display_dialogs = app.displayDialogs;
	app.preferences.rulerUnits = Units.PIXELS;						// set the ruler units to PIXELS
	app.displayDialogs = DialogModes.NO;							// Set Dialogs off
	//newFile = theFile.name.substr(0,theFile.name.indexOf(".pdf"));	//New File name
	newFile = app.activeDocument.name.substr(0,app.activeDocument.name.lastIndexOf("-"));	//New File name
	var doc = app.documents.add(app.activeDocument.width.value, app.activeDocument.height.value, app.activeDocument.resolution, newFile, NewDocumentMode.RGB, DocumentFill.TRANSPARENT ); // create a new document
	for (var i=0;i<documents.length-1;i++) {						// stack a layer for the open document into the new document page 1 on botton	
	//for (var i=documents.length-2;i>-1;i--) {						// stack a layer for the open document into the new document page 1 on top
		app.activeDocument = documents[i];							// switch active document
		var layerName = app.activeDocument.name;					// get document name
		app.activeDocument.flatten();								// Flatten remove transparency
		var idDplc = charIDToTypeID( "Dplc" );
		var desc259 = new ActionDescriptor();
		var idnull = charIDToTypeID( "null" );
        var ref24 = new ActionReference();
        var idLyr = charIDToTypeID( "Lyr " );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref24.putEnumerated( idLyr, idOrdn, idTrgt );
		desc259.putReference( idnull, ref24 );
		var idT = charIDToTypeID( "T   " );
        var ref25 = new ActionReference();
        var idDcmn = charIDToTypeID( "Dcmn" );
        ref25.putName( idDcmn, documents[documents.length-1].name );
		desc259.putReference( idT, ref25 );
		var idNm = charIDToTypeID( "Nm  " );
		desc259.putString( idNm, layerName );
		var idVrsn = charIDToTypeID( "Vrsn" );
		desc259.putInteger( idVrsn, 5 );
		executeAction( idDplc, desc259, DialogModes.NO );			// Copy Layer to document
		app.activeDocument = documents[documents.length-1];			// switch to newly created document
		layerName = layerName.substr(0,layerName.indexOf(".pdf")); 
		app.activeDocument.activeLayer.name=layerName;				// label layer with Document name
	}
	app.activeDocument = documents[documents.length-1];				// switch to newly created document
	var layers = activeDocument.layers;								// get layers
	activeDocument.activeLayer = layers[layers.length-1]			// Target Bottom Layer
	activeDocument.activeLayer.remove();							// Remove original layer
	while  (documents.length>1) {									// close all opened document except the newly created document							
		app.activeDocument = documents[0];		
		activeDocument.close(SaveOptions.DONOTSAVECHANGES);
	}
	app.togglePalettes();											// toggle user's palettes back on	
	app.runMenuItem(charIDToTypeID(("FtOn")));						// fit the document to the screen 
	app.displayDialogs = orig_display_dialogs;						// Reset display dialogs 
	app.preferences.rulerUnits = orig_ruler_units;					// reset units to original settings
}

Thanks, Chuck. No, I don't, since I don't want any dialog in my script.
But I'm getting wrong positions in my final file because these particular ones (and I don't know why) are opening like simple JPGs and not as PDFs, as I expect (with all the background in its original size).

Thanks!

But how the PDFs could be different since them both are exported from the same InDesign file, using absolutelly same settings?