Fujitsu fi-4860C Operator's Manual page 59

If you save scanned documents using this procedure, the file
size is very large. If you would like to reduce the file size, please
HINT
follow the procedure below. (It may take more time than usual)
1.Select [File (F)] - |[Print (P)...].
2. Following dialog is displayed, then specify [Acrobat Distiller]
for [Print Name].
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2.2 Saving Scanned Images in PDF Format