Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8d472eabed525e…

MALICIOUS

PDF

12.1 KB
MD5: e5bc380a4c5e5b2796b4b2f2ae98c15d SHA-1: bc68a196b57e3f238896cf9c4ce4f3ecb094f9fd SHA-256: 6f8d472eabed525ead2e17f3790297011db9633e26e4960c4fd2ceefd76f0f51
130 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it contains exploit code. The presence of an embedded file and the use of ASCIIHexDecode filter with exploit indicators suggest it's designed to download and execute a secondary payload from the suspicious URL. The XFA form structure is also a common vector for PDF exploits.

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://46.16.240.18/XXTUrEIs6VvsDRypoNT1MfSrKMbS96ij?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
dc642f4d11b91360b47b618946e4387586e1adbb97894e334cbc715a70161c4e		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1878 bytes

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