How to verify a .cms-file?

[Keine Eile]

Hi list members,

I got a file 'document.pdf' and a 'document_pdf.cms. Using 'openssl pkcs7'. It 
seems to be DER encoded and I can extract multiple certs, a CA, an intermediate 
and a signer's certificate. I have tried some variants of 'openssl cms 
-verify', but most end with a
~~~
Error reading S/MIME message
139979872399808:error:0D0D40D1:asn1 encoding routines:SMIME_read_ASN1:no 
content type:../crypto/asn1/asn_mime.c:391:
~~~
Some idea?

Thanks!