By producing pdfs by your own (maybe from word processor or other software) almost always you will obtain documents that are more Kbts avids than needed. Here's posted a single bash command line that will stream down the pdf size.
Before some concrete results I've obtained:
A 1.2M --> 97k
B 1,2M --> 120k
C 1,5M --> 152k
D 1,6M --> 97k
E 3,0M --> 253k
F 787k --> 50k
and so on...
The code:
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf