Note: I work for SoftArtisans, makers of OfficeWriter.
OfficeWriter does not currently support converting Excel/Word files to PDF. We generally recommend a 3rd party component to convert to PDF. However, many of these components require having Office installed on the server, which Microsoft does not advise. Therefore, it is important that you choose a converter that either does not require having Office on the server, or manages it carefully
Here are a few solutions for converting Word to PDF that we’ve recommended to our users in the past:
• Word Services for Sharepoint – If you are using SharePoint Server 2010, then you can use Word Services to perform the format conversion. More information about this solution can be found at: http://msdn.microsoft.com/en-us/library/office/ff181518.aspx
• Rainbow PDF - rainbowpdf.com
• EasyPDF - pdfonline.com/easypdf/
For more information, please see our blog post: http://blog.softartisans.com/2011/08/05/kb-tools-to-convert-word-documents-to-pdf/