I found this: Instructions
1 Load Adobe Acrobat and click "Create PDF" on the toolbar. Choose "From Multiple Files" from the list of options. You can also access the "Create PDF" tool under the "File" menu. A dialog box will appear that you can use to combine the files.
2 Click "Browse" to find the PDF files that you need to combine on your computer, one at a time. Sponsored Links
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3 Change the order of the PDF files under the "Arrange Files" sections. You can move a file up, down or delete it from the list. The final order that you see in the "Files to Combine" list is how the files will appear in the final, combined PDF.
4 Select "Include all open PDF documents" if it is not already selected. This tells Acrobat to combine all the files, even if they're open at the moment.
5 Click "OK" to start the merging process. The new PDF will display on your screen. Save the file to your computer and view it from Adobe Reader to make sure that everything displays correctly before sending it on to your contacts. Read more: http://www.ehow.com/how_5828664_combine-pdf-files-one-file.html#ixzz31DZzEK2a