.pdf and .doc files corrupted on 2 Macs?

Question

On an iMac and a shared Mac Mini, a number of PDF and DOC files have all of a sudden gotten corrupt. Some of these have not been modifed in 2 years but all of a sudden are corrupt. I've tried Data Rescue and cannot find anything online about these multiple files getting corrupted. I've rebuilt permissions and done various ML Cache Cleaner options to no avail. Anyone heard of anything like this? It just happened all of a sudden on 2 computers. At first I figured the first computer had the partition going bad but that doesn't explain 2 computers at once.

Answer 1

Dear M.V,
with the same above configuration, now I am able to open pdf's which are having a size lessthan 2 MB.
below is the access log
127.0.0.1 - - [13/Feb/2008:15:04:36 +0530] "GET /pdfcheck.php?file=CampusMap HTTP/1.1" 200 2000000 below is the error log
[13/Feb/2008:15:10:49] warning ( 3288):  for host 127.0.0.1 trying to GET /pdfcheck.php, finish-response reports: HTTP2228: Response content length mismatch (2000000 bytes with a content length of 2535786)  php code
<?php
if(!isset($_GET['file']))die('LOGGED! no file specified');
$file_path=$_SERVER['DOCUMENT_ROOT'].'/pdfs/'.strip_tags(htmlentities($_GET['file'])).'.pdf';
  $file_name = $_GET['file'];
$mm_type="application/pdf";
header("Cache-Control: public, must-revalidate");
header("Pragma: hack");
header("Content-Type: " . $mm_type);
header("Content-Length: " .(string)(filesize($file_path)) );
header('Content-Disposition: inline; filename="'.$file_name.'"');
header("Content-Transfer-Encoding: binary\n");
readfile($file_path);
?>Thanks
madhu