I just came across an interesting tool, which merges individual PDF pages online. This is useful as you will not able to merge PDF pages, via any of the freely available tools by Adobe.
If you have many PDF pages in different PDF files, you can use this online application to merge all of the pages to a single document. This helps to keep your document safe, and you do not really have to handle large number of pages separately.
Navigate to this Website
Just browse the files, and Click on Merge , you will be prompted to download the merged PDF file!