Read Document is used to read any file into a document (com.adobe.idp.Document) variable type. It works for PDF, Word, Excel, and any other file object.
Is there an exception being thrown when you try to open PDFs and XLS files?
No. The file itself is not read.
The error thrown when the process is invoked is file not found(If i place a pdf or xls file. for doc file it works).
I have confirmed that the file is in its location as mention in the source path.
Not sure what to tell you. I've tested it and it works fine here - and reading PDFs into document objects is a pretty common thing.
Can you post your process and one of your documents?