As I said, the file size depends heavily on the compression.

You are using JPG compression, which is  good for photo-type images, but
not for scans of text.

The image is 8-bit, when 1-bit would have done.

You say that you are using thresholding, but the log file doesn't show
this.

Try scanning with scan mode = lineart, and save the PDF with compression
= auto.

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https://bugs.launchpad.net/bugs/922162

Title:
  pdf output file is 6 times bigger than if created by simple-scan

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