"Can't open file - not a valid pdf"

Hi,
This seems to have been asked before but I can't find an answer!!
I have a small app that i use for work which essentially just links to pdfs stored on a wordpress site
All has been working well until recently when android phones can no longer open the files - they get a "can't open file - not a valid pdf file" message
It seems to happen with many but not all the files. Some examples of problematic ones are:
http://uhbsosguidelines.files.wordpress.com/2014/02/transfusionmajorhaemorrhagecompressed. pdf
http://uhbsosguidelines.files.wordpress.com/2014/02/aagbi_la_toxicitycompress.pdf
http://uhbsosguidelines.files.wordpress.com/2015/01/anaphylaxis-under-anaesthesiaupdated02 14compresresave.pdf
Oddly, it seems only to be a problem when trying to open directly from the link in the app into adobe reader. If you download the file onto the phone THEN open it in Reader it works fine!
As I say, this seems to be a recent problem - has been working perfectly up until now.
I'd really appreciate it if you have any thoughts / suggestions - I don't want to have to ask all the users to install a different PDF reader app!

Thanks for reporting the issue. We have been able to reproduce it at our end and shall let you know when this gets fixed in one of the future releases.
Thanks,
Adobe Reader Team

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