The problem seems to be pdfinfo is returning non UTF-8 data on your system, despite passing the -enc UTF-8 option to it. Probably a bug in this version of poppler (which is where pdfinfo comes from).
Can you run the followoing in the direcotory containing the pdf file
Code:
calibre-debug -c "from calibre.ebooks.metadata.pdf import *; pdfinfo, pdftoppm = get_tools(); subprocess.call([pdfinfo, '-enc', 'UTF-8', 'UTP1007.pdf'])" > output.txt
and post the output.txt file for me to look at.