Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16e8b7c034f510c…

MALICIOUS

PDF

199.9 KB Created: 2010-07-26 16:38:32 Authoring application: Microsoft® Office Word 2007
MD5: f3f2c4f9d3d857aa3a77885a80f623ba SHA-1: 4ba189c14ed59e3542d4474d97036309ced7fa42 SHA-256: d16e8b7c034f510c216d5874ab20eb59d482bf2b8031bfbd280865fcbe0379d7
114 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is related to CVE-2023-26369, indicating an attempt to exploit a vulnerability. The ML classifier strongly flagged this PDF as malicious. While the document body is heavily obfuscated and unreadable, the presence of JavaScript and exploit indicators points to a malicious document designed to execute code. The embedded URLs are not directly indicative of malicious activity but are included as potential indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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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