Malicious PDF — malware analysis report

Static analysis result for SHA-256 04446a5ffaf7d812…

MALICIOUS

PDF

12.1 KB
MD5: f86865ceb230df3db1dd43b9cf234c0e SHA-1: 7fae900e2654cbf589c7894ec50736d76c120b6d SHA-256: 04446a5ffaf7d81234760ed77b12fe99833c282fb43694c9b5ed61ff6252d1f0
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 ClamAV and an ML classifier, indicating it contains an exploit. The presence of an embedded file and an unknown-reputation URL suggests it is designed to download and execute a second-stage payload. The XFA form and ASCIIHexDecode filter are common techniques used in 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://46.16.240.21/DGLU1o2Hgkh3gsJAetr4oUjKHO4ICPlT?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
b341d932615aaa9079d568f2d68b67f84a97f754d37d03da280af21d6b34f01f		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1878 bytes

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