Adding keywords when exporting to .pdf

I got it only from photoshop.

I only manage use an workaround if you open de desired images on photoshop.

And to add keywords means that I must use "PDF presentation" script  = one image on each PDF page

PDF presentation script will need a image list. I used on photoshop all opened images passing them on a list object (list1).

There are other additions that can be enabled but I couldn't found how to use this with "contact sheet" script (several images per page).

It adds the keywords found on the doc in the text next to the image.

//////////////////////////////////////////////////////////////////////
#target photoshop;
app.bringToFront();
//
if (app.documents.length > 1) {
    var list1 = new ActionList(); // will get all the group of opened images to add to the PDF
    app.preferences.rulerUnits = Units.PIXELS;
    // if it has been created before, it deletes it
    var saveFile = File(Folder.desktop + "/myPDF.pdf");
    if (saveFile.exists) File(saveFile).remove();
    //
    var thisDoc = app.activeDocument;
    //
    app.activeDocument = app.documents[0];
    for (var mlh=0; mlh < documents.length ; mlh++) {
        app.activeDocument = app.documents[mlh];
        app.activeDocument.info.title = "keywords: " + app.activeDocument.info.keywords.join(" || ") ;
        list1.putPath( new File( app.documents[mlh].fullName.toString()) );
    }
    app.activeDocument = thisDoc;
    //
    savePDFpresentation(saveFile);
}
////////////////////////////////////////////////////////////////////////
function savePDFpresentation(saveFile) {
    var desc4 = new ActionDescriptor();
    // list1 was created/collected outside
    desc4.putList( charIDToTypeID('flst'), list1 );
    desc4.putPath( charIDToTypeID('T   '), new File( saveFile) );
    //
    desc4.putEnumerated( charIDToTypeID('BckC'), charIDToTypeID('BckC'), charIDToTypeID('Wht ') ); // 'Blck':black | 'Wht ':white
    desc4.putInteger( stringIDToTypeID('fontSize'), 10 ); // I can't center text
    desc4.putBoolean( stringIDToTypeID('includeFilename'), true );
    desc4.putBoolean( stringIDToTypeID('includeExtension'), false );
    desc4.putBoolean( stringIDToTypeID('includeTitle'), true );
    desc4.putBoolean( stringIDToTypeID('includeDescription'), false );
    desc4.putBoolean( stringIDToTypeID('includeAuthor'), false );
    desc4.putBoolean( stringIDToTypeID('includeCopyright'), false );
    desc4.putBoolean( stringIDToTypeID('includeEXIFData'), false );
    desc4.putBoolean( stringIDToTypeID('includeAnnotations'), false ); // true if you want to include localized text annotations (tool: Notes) from photoshop on PDF
    //
    var desc5 = new ActionDescriptor();
    desc5.putString( stringIDToTypeID('pdfPresetFilename'), "High Quality Print" );
    desc5.putBoolean( stringIDToTypeID('pdfPreserveEditing'), false );
    desc5.putBoolean( stringIDToTypeID( 'pdfEmbedThumbnails' ), true );
    desc5.putInteger( stringIDToTypeID('pdfCompressionType'), 10 ); // maximum quality = 10
    desc5.putBoolean( stringIDToTypeID('pdfViewAfterSave'), true );
    //
    desc4.putObject( charIDToTypeID('As  '), charIDToTypeID('PhtP'), desc5 );
    executeAction( stringIDToTypeID('PDFExport'), desc4, DialogModes.NO );
}