We discussed this on a number of occasions and here are a couple of threads on the subject that you may find of interest.

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Generally, a page title is a key part of descriptive use with a search engine, however, as with any title, don't over-optimize it.

<Pageoneresults> says:
Okay, just confirmed my statement above. Google indexes the first visible text on page one of the .pdf. Anything that is part of a header or footer seems to be invisible. So, if you had a logo, address and corporate tagline at the top of your document in a header element, Google won't see it. What it does see, is that first headline text on the page.

If this is the case I have a serious SEO problem. I have long pdf files with pictures which are not easily converted into HTML pages.

However I am not sure header is invisible. I think they index the header.

The following message was cut out to new thread by engine. New thread at: search_engine_promotion/3173330.htm [webmasterworld.com]
11:32 am on Nov. 30, 2006 (utc 0)