Malicious PDF — malware analysis report

Static analysis result for SHA-256 4881a1eb340d849e…

MALICIOUS

PDF

12.0 KB
MD5: 61f5792d2122df927fe772a629a44167 SHA-1: 68df8a89fb4369d1d0d53ddb10ffc24047cd5ae6 SHA-256: 4881a1eb340d849e8050baed2bbe31c591fe10c37b13ae82de36c475b8d3b9c2
98 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV with the signature Pdf.Exploit.Dropped-90. Static analysis indicated the presence of an embedded file and the use of ASCIIHexDecode filters, which are common in PDF exploits. The file's structure suggests it is designed to exploit a vulnerability and drop a secondary payload.

Heuristics 5

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
a5e8aa7e3ddd10a930a2a1e6f5ba6ac8386a1844632457034e550cf89e584bbd
pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1874 bytes