Reduce the size

You can use GhostScript for reducing the size of a pdf

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dBATCH  -dQUIET -sOutputFile=hector_nuba_.pdf hector_nuba.pdf

There are several options:

-dPDFSETTINGS=/screen  (75ppp)
-dPDFSETTINGS=/ebook   (150ppp)
-dPDFSETTINGS=/printer (300ppp)

If you use the printer option you may get a ...

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Trace all the fonts

You can trace all the fonts in a pdf using this command:

gs -o file-with-outlines.pdf -dNoOutputFonts -sDEVICE=pdfwrite file.pdf
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