Memory isn't listed in any report anywhere on a Mac; you must be confusing it with something else. You can also find crash reports at ~/Library/Logs/CrashReporter/Safari.crash.log; the most recent report is the last one in the file, so it's at the bottom.
You need to start at the bottom and work up to the point where you see a Date/Time and other header information and Copy and Paste that into your reply.
Date/Time: 2008-10-19 23:34:14.581 -0400
OS Version: 10.4.11 (Build 8S165)
Report Version: 4
Parent: WindowServer 
Version: 3.1.2 (4525.22)
Build Version: 6
Project Name: WebBrowser
Source Version: 45252200
Exception: EXCBADACCESS (0x0001)
Codes: KERNPROTECTIONFAILURE (0x0002) at 0x0000a89b
Thread 0 Crashed:
0 com.adobe.acrobat.pdfviewer 0x0a01c454 dyldstub_pthread_keycreate + 167732912
1 com.adobe.acrobat.pdfviewer 0x0a016dfc dyldstub_pthread_keycreate + 167710808
2 com.adobe.acrobat.pdfviewer 0x0a0212a8 dyldstub_pthread_keycreate + 167752964
3 com.adobe.acrobat.pdfviewer 0x0a0215d4 NP_Shutdown + 20
4 com.apple.WebKit 0x95c3bb40 -[WebNetscapePluginPackage(Internal) _unloadWithShutdown:] + 96
5 com.apple.WebKit 0x95c3bac8 -[WebNetscapePluginPackage wasRemovedFromPluginDatabase:] + 104
6 com.apple.WebKit 0x95c3b8c0 -[WebPluginDatabase(Internal) _removePlugin:] + 256
7 com.apple.WebKit 0x95c3b780 -[WebPluginDatabase close] + 80
8 com.apple.Safari 0x0003b830 0x1000 + 239664
9 com.apple.Safari 0x0003b378 0x1000 + 238456
10 com.apple.Safari 0x0003b200 0x1000 + 238080
11 com.apple.Safari 0x0003b11c 0x1000 + 237852
12 com.apple.Safari 0x000ca568 0x1000 + 824680
13 com.apple.Foundation 0x92bf4a5c nsnotecallback + 180
14 com.apple.CoreFoundation 0x90805ec0 __CFXNotificationPost + 368
15 com.apple.CoreFoundation 0x907fdf20 _CFXNotificationPostNotification + 684
16 com.apple.Foundation 0x92bdee64 -[NSNotificationCenter postNotificationName:object:userInfo:] + 92
17 com.apple.AppKit 0x938540e4 -[NSWindow _close] + 100
18 com.apple.AppKit 0x93854048 -[NSWindow close] + 36
19 com.apple.Safari 0x0003aa4c 0x1000 + 236108
20 com.apple.Safari 0x0003a9b8 0x1000 + 235960
21 com.apple.Foundation 0x92bfc56c -[NSArray makeObjectsPerformSelector:withObject:] + 264
22 com.apple.AppKit 0x93857054 -[NSApplication _deallocHardCore:] + 204
23 com.apple.AppKit 0x93855c1c -[NSApplication terminate:] + 520
24 com.apple.AppKit 0x938538b4 -[NSApplication sendAction:to:from:] + 108
25 com.apple.Safari 0x0002ca94 0x1000 + 178836
26 com.apple.AppKit 0x938ae094 -[NSMenu performActionForItemAtIndex:] + 392
27 com.apple.AppKit 0x938ade18 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 104
28 com.apple.AppKit 0x937b5150 _NSHandleCarbonMenuEvent + 372
29 com.apple.AppKit 0x937b2ab4 _DPSNextEvent + 1280
30 com.apple.AppKit 0x937b23f8 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 116
31 com.apple.Safari 0x000082f0 0x1000 + 29424
32 com.apple.AppKit 0x937ae93c -[NSApplication run] + 472
33 com.apple.AppKit 0x9389f458 NSApplicationMain + 452
34 com.apple.Safari 0x000b7e0c 0x1000 + 749068
35 com.apple.Safari 0x000b7b10 0x1000 + 748304
It looks like a Plug-In is the problem, so try this:
Quit Safari if it's running.
2. Launch Adobe Reader, go to Preferences > Internet and uncheck the box at the top where it says "Display PDFs in browser using:", then quit Adobe Reader.
3. Launch Terminal and paste this command, then press Enter and quit Terminal when the cursor appears again (immediately if the command executes properly).
defaults write com.apple.Safari WebKitOmitPDFSupport -bool false
4. Restart Safari and try opening a PDF file online or from your Mac and see if it crashes.
Your internet plug-ins are suspect.
Go to Hard Disk/Library/Internet Plug-ins and drag the following to the desktop (but don't delete them yet):
Adobe PDF Viewer (check which version you have, it comes with Adobe Reader, the latest version of which is 9)
Netscape Plugin (Should be RealPlayer Plugin)
Restart Safari and see if that helped.
If it did, download and install Adobe Reader v.9 from http://www.adobe.com/products/reader/
and RealPlayer 11 for Mac from:
Once installed, perform this routine:
Repairing permissions is an important part of regular maintenance, and should always be carried out both before and after any software installation or update.
Go to Disk Utility (this is in your Utilities Folder in your Application folder) and click on the icon of your hard disk (not the one with all the numbers).
In First Aid, click on Repair Permissions.
This only takes a minute or two.
Background information here:
An article on troubleshooting Permissions can be found here:
If you were having any serious problems with your Mac you might as well complete the exercise by repairing your hard disk as well. You cannot do this from the same start-up disk. Reboot from your install disk (holding down the C key). Once it opens, select your language, and then go to Disk Utility from the Utilities menu. Select your hard disk as before and click Repair.
Once that is complete reboot again from your usual start-up disk.
More useful reading here:
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
Post back with results!