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critical
CVE likely
CVE_2008_3005
What it means
Legacy Excel BIFF8 workbook combines a narrow FORMAT-index cluster with large OLE slack payload staging.
Why it fires
CVE-2008-3005 is the Microsoft Excel Index Array vulnerability from MS08-043. The rule is deliberately narrow: it requires a BIFF8 Workbook/Book stream with the observed low FORMAT-index cluster and a normal XF table, plus a large unallocated OLE sector region where pre-macro-era Excel exploits stage shellcode. Low built-in FORMAT records by themselves occur in clean workbooks, so the OLE slack payload-hiding context is mandatory for CVE attribution.
Other CVE heuristics
CVE_2026_34621_RELATED CVE_2023_26369 CVE_2026_34621 CVE_2010_1297_FLASH_RICHMEDIA CVE_2010_1297_SWF_TRIGGER CVE_2011_0611_SWF_TRIGGER CVE_2009_1862_FLASH_RICHMEDIA CVE_2010_2883 CVE_2018_4901 CVE_2009_3459 CVE_2018_4990_JPX_EMBEDDED_CMD CVE_2018_4990_JPX_CMAP_TRIGGER CVE_2010_1240 CVE_2010_0188 CVE_2014_0514 CVE_2013_3346 CVE_2013_0640 CVE_2010_3654_FLASH_RICHMEDIA CVE_2007_5020_MAILTO_MSHTA CVE_2014_0496 CVE_2008_2551 CVE_2021_40444 CVE_2006_4694 CVE_2008_0118