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To add JS resource to catalog module 

add Magento_Catalog/web/js/custom.js file
-------------------------------------------------

define('jquery', function($) {
        $.fn.HelloWorld = function() {
            console.log("Hello Firstfound");
            $(".page-title").hover(function () {
                $(".page-title").css('background-color', 'orange');
            });
        }

    }(jQuery)
);

--------------------------------------------------------------------------
add file Magento_Catalog/requirejs-config.js 
var config = {
    map: {
        '*' : {
            'hello' : 'Magento_Catalog/js/custom'
        }
    }
};

----------------------------------------------------------

Add file Magento_Catalog/templates/product/js.phtml
<script>// <![CDATA[
    require([
        'jquery',
        'hello'
    ], function ($) {
        $('.product-info-main').HelloWorld();
    });
    // ]]>
</script>

   /* <div id="modal">
        <div id="msg" style="display: none">Modal contents</div>
        <button class="modalRun">Run action</button>
    </div>
    */


<script>
    require([
        'jquery',
        'Magento_Ui/js/modal/alert'
    ],
    function($, alert){
        $('#modal').on('click', 'button.modalRun', function (event) {
            event.preventDefault();
            alert({
               content: $(event.target).parent().children('#msg').text()
            })

        })
    });
</script>