Why some pdf file can't open or have garbage characters?

Sometimes ,when i open a pdf file ,i find it can't be open or opened as blank,or opened as garbage characters.
i want to konw the reason.
later, i search some information by internet,someone tell me it is caused by the pdf standard,for example pdf/a or pdf/x,
because the failed pdf can't conform to the pdf/a or pdf/x.
and someone tell me the reason is the code,and so on.
nowadays,i also find the real reason.
who can give me some help?
Thank you!

can you tell me your E-mail,or other way to chat with you on line.
something may be said immediately in detail.

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