Adobe Acrobat Reader want to modify my pdf when closing it. Why?

Hi,
I'm working on a small and simple pdf generator (as said in my previous question).
When opening my generated pdf with Adobe Acrobat Reader, all is OK.
But when I'm closing it, Adobe Reader popup a message asking  if I want to save the modifications.
Why Adobe Reader want to modifiy my pdf??
Is there something wrong with it?
Here is a realy tiny small sample of a one blank page generated pdf (all is pure ASCII because there is no compression, no data stream,... and it's a copy/paste from a text editor, so I've no translated typo into my message).
I think I've followed the specification; but perhaps I've missed something?
%PDF-1.7
1 0 obj <</Type /Catalog /Pages 2 0 R>>
endobj
2 0 obj <</Type /Pages /Kids [4 0 R] /Count 1>>
endobj
3 0 obj
  <<
    /Producer (PdfLib)
    /CreationDate(D:20130710152728+02'00')
    /ModDate(D:20130710152728+02'00')
  >>
endobj
4 0 obj <</Type /Page /Parent 2 0 R /MediaBox [0 0 595 841] /Resources <<>> /Contents 5 0 R>>
endobj
5 0 obj
<</Length 0>>
stream
endstream
endobj
xref
0 6
0000000000 65535 f
0000000009 00000 n
0000000056 00000 n
0000000111 00000 n
0000000240 00000 n
0000000341 00000 n
trailer <</Size 6 /Root 1 0 R /Info 3 0 R>>
startxref
387
%%EOF
Regards
Alex

And so.. what is invalid?
I've uploaded the pdf files as example:
My generated pdf
http://compuhelp.free.fr/adobe/before.pdf
The modified version by Adobe Acrobat Reader:
http://compuhelp.free.fr/adobe/after.pdf
(I can generate a more complexe pdf file with fonts, images,... it will be displayed correctly, but Adobe always want to modifiy it).
So perhaps I missed somthing into the pdf file format specification ?

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