Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5bbb3bae8213fe…

MALICIOUS

PDF

19.1 KB
MD5: 9584ac96dee88c9b1217465a51958eaf SHA-1: aa3f0455cb19ad64065373a0f67051aeb3881187 SHA-256: 4c5bbb3bae8213fe2a8d57b808e83365fa6192e407b9217b5b09896b048d97d6
98 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. ClamAV also detected it as 'Pdf.Exploit.Dropped-78', suggesting it's a known exploit dropper. The presence of an embedded file further supports the malicious nature of this document. The exact attack pattern is unclear due to the lack of document body text, but it likely leverages a PDF exploit 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
c33fb2a29667cb0b92d9f2ebab29145d14f6bddb404a9a7ad6fcd6af6857b355		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18774 bytes

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