[This has been achieved by means of emulation, by running Basilisk II under Window$. The original file was an ordinary text with no format done with my usual Office suite in Linux (I use AbiWord), then saved as a .txt file and converted into the Basilisk emulator by means of Adobe Acrobat Exchange, that happily created a full PDF 1.0 compatible output file.

As it has been said, almost no task is impossible with computers. So the best when you really believe in something is «don't ever give up».

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I don't think anyone ever said to "give up" or that it was "impossible". We all routinely agree on these boards that anything is possible given time, effort, expertise and/or money. All anyone tried to do on this thread is ascertain what you hoped to accomplish. I still don't see the need to read modern PDFs on an older Mac, if you must have an alternative for reading them in order to convert them to 1.0. Thrilled to have the option if anyone ever comes up with a reason to have it.

However, I am completely confused about the process you came up with. I have Basilisk II and don't understand using Adobe Acrobat Exchange to convert into it. You don't need anything to convert files into Basilisk II, just a hard disk image. Is Acrobat exchange being used inside Basilisk II? If so under what operating system? Whatever the method it sounds like the key is the version of Acrobat Exchange is they key and is nothing other than what has been suggested here. If you find the software that supports file conversion to 1.0 as Tom Lee has repeatedly pointed out, then you can do what you want. Does this mean you have found the proper software?