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Images in PDF are embedded in the document.
PDF files are usually created by converting Word (or other applications
supporting the conversion process) files, which would contain your pictures.
The PDF format contains all the text images in one document, thereby giving
the name "portable document format".
MS Publisher is another application that you can use to convert *.pub to
PDF.
The conversion is done with Adobe Acrobat Standard or Professional (there
are other products around to do the conversion), and you're effectively
"printing" to a file. The Adobe converter is listed in your printer list as
"Adobe PDF Writer" or "Adobe Distiller" (or similar).