Please be aware that MS Publisher is not nearly as popular a utility as once was, and is absent in all but Pro and Enterprise versions of Office since 2001 ..... meaning that very few visitors will be able to open the file or even view it unless they have it already on their system.
You would be advised to save your Publisher document first as a Word document, and then to convert it to a PDF using the mentioned utility.
Other Free software utilities are available in this thread, and will make many of your web-building tasks easier to have within your toolbox!