Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff1102b403a0efa…

MALICIOUS

PDF

9.94 MB
MD5: 98d15b2cedba7c1f25d7b6ef5a9dd5c0 SHA-1: 8e826bedc7dfc7c90d9de6c701ce538daa0625f8 SHA-256: cff1102b403a0efa65dc47ac010f7fe15e08d9903ec05b4395c29f95d004de7e
76 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The PDF file contains embedded JavaScript and exhibits characteristics related to CVE-2023-26369, indicating an attempt to exploit a vulnerability for code execution. The high stream count suggests obfuscation techniques were employed. No specific malware family was identified, but the exploit pattern is clear.

Machine Learning

  • Nyx PDF Classifier clean score 0.0305

Heuristics 5

  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • Unusually high stream count medium PDF_MANY_STREAMS
    PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_053_off000e8a15.bin
a4ae9f0c63549c0a914e76ae9d9bf9d1e39ab621d928f659f80ef8cd44759acb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE8A15 472590 bytes
stream_079_off0015d9f3.bin
057738d02ca835f3bfc5d462aefdf6feb9ffa43bf3fcb1e363031f9a39ba70c9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15D9F3 1514700 bytes

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