To remove "Available memory" debug message, you need to call RadaeePDFPlugin.setDebugMode before calling open/show methods:

//open pdf from path
open: function() {
    console.log("Opening PDF...");
    
    RadaeePDFPlugin.setDebugMode({mode:false});

    RadaeePDFPlugin.open(
        {
            url: "file:///mnt/sdcard/Download/Test.pdf",
            password: "" //password if needed
        },
        function(message) {
             console.log("Success: " + message);
        },
        function(err){
            console.log("Failure: " + err);}
    );
}