Now that you have created a rule, we should test it to make sure it is working.
Open the Word to PDF space in the Alfresco Explorer.
Click on the Add Content button in the upper-right area of the explorer.
Browse and find a Word file you want to convert.
Click on OK.
You can leave all of the options on the Modify Content Properties page at their defaults and click on OK.
Your Word file should now be added to the Word to PDF space. If you look in the PDF space, you should see the PDF version of the Word file.
You have just tested your new rule for converting Word files to PDF. Moving forward, you should be able to simply add Word files to the folder and then link to the PDF version within Moodle.