MALICIOUS
100
Risk Score
Heuristics 2
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Excel Index Array exploit — CVE-2008-3005 critical CVE likely CVE_2008_3005Legacy Excel workbook has the CVE-2008-3005 exploit shape: a compact BIFF8 FORMAT-index cluster paired with a normal XF table and a large unallocated OLE slack region used to stage the payload. The FORMAT pattern alone is not sufficient, so the rule requires the OLE slack payload-hiding context to keep false positives low.
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 123,773 bytes but its declared streams total only 21,308 bytes — 102,465 bytes (83%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
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