Create the six pages as a single six page pdf file.  Call it magazine.pdf
(or any file name you like).  Make a image file of the cover, i.e., a gif,
png etc. magazine.gif (name of your choice).

On the website server create a folder, i.e.,   downloads
Upload magazine.pdf into the downloads folder.

Now edit your website in the Publisher file.  Somewhere, any page you like,
put the magazine.gif image file.

Now click on the magazine.gif image, select from the tool menu, Insert,
Hyperlink.  In the Hyperlink box type

/downloads/magazine.pdf

Ok it and now save the Publisher file as a webpage or Publish to the web
whatever your version requires; upload the new files.

Open your website, click on the magazine image and your six page pdf file
should appear.

Good luck.

In addition to what Don says; if you want links within the PDF to go from
page to page you'll have to put those in when you create the PDF with
whatever PDF creator you are using....otherwise the viewer can just scroll
through the pages without links.

If you want the view to truly download the file and not view it online
through their browser/Acrobat then you should .zip the PDF - that will force
a download of the zip - which may be confusing to some viewers.