Malicious PDF — malware analysis report

Static analysis result for SHA-256 74aac08074ebf24d…

MALICIOUS

PDF

12.0 KB
MD5: f6fd35f6c68b8776f1e994d9a008e455 SHA-1: 9d85333ee00b4f3ddff4771ebd113111cba803d2 SHA-256: 74aac08074ebf24d196c61f32473c6d7e1f82ddcabfecaa4792777bf0ba7005e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is a PDF with XFA forms and embedded content, flagged by ClamAV and a machine learning classifier as malicious. The presence of ASCIIHexDecode filters with exploit indicators and an embedded file suggests it's designed to exploit a client-side vulnerability. The embedded URL is likely used to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-90 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-90
  • 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
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gghte.ru/KGsi8EZLpoKoMgU0V7M01yBR6a9kd4PN?pp=1?plugin=1
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
45f87b5d9cb85296ef8621c20844aaf50e11c53730a1408e804cf7ea1e1b833d		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1874 bytes

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