Invalid Signature (how to report a (potential) bug ) ?

Hi,
we have a PDF document signed via our IE browser (CAPICOM).
When we open the document Acrobat (Professional) - version 8/9 - tells us the document has been modified since the signature was placed - which is of course not true.
When we open this in another product (Nitro Reader) this product accepts the signatures and tells us the document is valid.
We believe this could be a bug in Adobe Reader, so we can we open a "bug" report to get some help about this ?
FYI: The /Sig dictiorant is as follows:
/SubFilter /adbe.pkcs7.detached
/Name (SERIALNUMBER=660...)
/Filter /Adobe.PPKMS
/M (D:20090302134456+01'00')
/Type /Sig
/ByteRange [00000000 00154554 00163772 00000444 ]
/Contents <30820CAD06...>>
H.

Hi Leonard,
The document we are having problems with is is a rather confidential one so I cannot publicly post it.
If you send me your email address I can send it to you so you can have a look.
We found out that with this document alone we had this issue.
Attached ( http://www.speedyshare.com/918325897.html ) you'll find another example of a PDF document signed via IE/CAPICOM (signature coming from a cardreader).
The CAPICOM has created a *detached* PKCS7 object but Adobe Reader refuses to validate it .
If we generate a sha1 PKCS7 object with CAPICOM the Adobe Reader accepts the signature (valid).
Any idea why ?
Are there no tools which give more isight in the reason why ADobe invalidates the signature ?
Looking forward to your response...
H.

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