Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb67be01a79653c4…

MALICIOUS

PDF

26.3 KB
MD5: 40a17561ab26b1da741b81bbb6aa334b SHA-1: f5f6a6726898d57a798491896e174702fb0701c2 SHA-256: eb67be01a79653c4d232f455b49c7358582d173ebbcba2c59170eaae8e92cd1c
98 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was detected as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78. Static analysis revealed an embedded file and an embedded script payload, suggesting the PDF is a dropper. The embedded script, though partially obfuscated, indicates an attempt to execute malicious code. The presence of an embedded file further supports the hypothesis that this PDF is designed to download and execute a secondary payload.

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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: PSEOF. 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
eeae8c9da96dae4655782affd12be625cfa30dab0a9bb28863ad94e97e45cca4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 26126 bytes

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