tried looking at a couple regular (they open fine in adobe acrobat 8) pdf files and this is what was shown on the first few lines (as opposed to being able to actually read the documents)
using do 9.0.0.4
%PDF-1.6
%âãÏÓ
5423 0 obj <</Linearized 1/L 5398382/O 5426/E 118724/N 741/T 5289873/H [ 496 38326]>>
endobj
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5423 10
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0000039082 00000 n
0000039324 00000 n
0000039362 00000 n
0000039513 00000 n
0000046838 00000 n
0000049508 00000 n
0000000496 00000 n
trailer
<</Size 5433/Prev 5289860/Root 5424 0 R/Info 5422 0 R/ID[<961C4B6247AF96488C1DEE7366B41844><3619A98310B7E44CB54FE53AFED908C9>]>>
startxref
0
%%EOF