Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0674beb47da83b2…

MALICIOUS

PDF

200.8 KB Created: 2010-07-26 16:38:32 Authoring application: Microsoft® Office Word 2007
MD5: e8bafc38b33c101c88720f7502d63e1d SHA-1: 7a49af7205b202708e6a7134da9e90badd416a89 SHA-256: a0674beb47da83b2c04434d4714ee47aba8e05a9f6548a40fafc44589b68ddd5
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF sample contains embedded JavaScript and utilizes ASCIIHexDecode and ASCII85Decode filters, indicating obfuscated content. High-confidence heuristics indicate a relation to CVE-2023-26369, suggesting the PDF is designed to exploit this vulnerability. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload from one of the extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • 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.color.org
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/id/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00001f51.bin
1b3d79e17f65a53e314ece9e01b54b298fb91c87ba1abec996f3aa8ae086593b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F51 190988 bytes

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