strange problem with xpdf

[rcuppone]

i'm trying to open a pdf file, but i obtain an unreadable document without menaning and strange characters.
Anyway if i open it with acrobat reader in Windows everything is right.
I don't think it is a problem about fonts as with the tool pdffonts i get that informations:

name type emb sub uni object ID
------------------------------------ ------------ --- --- --- ---------
YVXKDE+Helvetica CID Type 0C yes yes yes 37 0
BOBCTY+Helvetica-Condensed CID Type 0C yes yes yes 10 0
BOBCTY+Helvetica-Condensed-Bold CID Type 0C yes yes yes 50 0
YFXKDE+SimonciniGaramond CID Type 0C yes yes yes 112 0
OYBCTY+SimonciniGaramond CID Type 0C yes yes yes 19 0
IHTSNK+Helvetica-Bold CID Type 0C yes yes yes 59 0
JFDYBI+SimonciniGaramond-Bold CID Type 0C yes yes yes 28 0
AQRWFA+SimonciniGaramond-Italic CID Type 0C yes yes yes 73 0
FPPAXQ+ArialMT CID TrueType yes yes yes 92 0

That is all fonts are embedded.

Besides with pdfinfo i get :

Title: Libro_manuale java
Creator: Adobe InDesign 2.0.1
Producer: Adobe PDF Library 5.0
CreationDate: Fri Oct 3 17:31:28 2003
ModDate: Fri Oct 3 17:32:24 2003
Tagged: no
Pages: 8
Encrypted: yes (print:no copy:no change:no addNotes:no)
Page size: 481.89 x 666.142 pts
File size: 121527 bytes
Optimized: no
PDF version: 1.4


What is the problem?
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