you have got few pdf's that you want to read in your psp and want to do it without those psp modding stuffs?
nims psp ebook reader v1.5 by nims13 allows you to do the job.
the v1.0 was complex which reduced user friendliness, this has been now simplified. also issues with windows vista and win7 has been corrected.
the reader comes with a converter(pdftotml) which along with ghostscript converts each pdf page into a separate html file. An Ebook Utility then combines it with nims psp ebook reader which gives you the adobe reader like experience in your psp.
README INCLUDED IN THE DOWNLOAD PACKAGE
here is the 4-minute full descriptive video of the app on how to use it and how it looks like in psp.
please reply to this post if it works or doesnt work for you.