I found this simple (very basic) program: SWIFT PDF
http://www.derring.com/swiftpdf/index.htm
DL http://www.derring.com/swiftpdf/files/swiftpdf.exe
I uniextracted the installer and the app stores its setting in an ini file.Swift PDF is useful for taking images (from scans, photos, downloads or any other source) and combining them into a single PDF document.
You can set the page sizes to any available paper size (Letter, Legal, A4, etc.), adjust the margins, page orientation and sizing options on each page. There aren't many more options or features than that, but it does its job simply and swiftly, and it's entirely free.
The basic idea in using this tool, is to create images of the documents and then put them in a pdf. I know: it´s not the best, but it can be a dirty shortcut to produce pdf docs without having to carry Open Office...
forgot: 1300 kb on disk