In this case i would recommend TET from PDFLIB
If you need to get a quick feel for what it can do, take a look at the TET Cookbook
This is not an open source solution, but it's currently the best option in my opinion. It's not platform-dependant and has a rich set of language bindings and a commercial backing.
I would be happy if someone pointed me to an equivalent or better open source alternative.
To extract text you would use the TET_xxx() functions and to query metadata you can use the pcos_xxx() functions.
You can also use the commanline tool to generate an XML-file containing all the information you need.
tet --tetml word file.pdf
There are examples on how to process TETML with XSLT in the TET Cookbook
What’s included in TETML?
TETML output is encoded in UTF-8 (on zSeries with USS or
MVS: EBCDIC-UTF-8, see www.unicode.org/reports/tr16), and includes the following information:
general document information and metadata
text contents of each page (words or paragraph)
glyph information (font name, size, coordinates)
structure information, e.g. tables
information about placed images on the page
resource information, i.e. fonts, colorspaces, and images
error messages if an exception occurred during PDF processing
