That's probably the cause. When you use a non-built-in font (something other than times, courier, helvetica, symbol, Adobe pi/Zapf Dingbats and their variants, collectively knows as the base-14 fonts), Acrobat embeds the entire font. It does this because the user may need to select any of the characters that the font contains. The base-14 fonts are guaranteed to be available, so there is no need to embed them.
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