Malicious PDF — malware analysis report

Static analysis result for SHA-256 b951b9ab59507853…

MALICIOUS

PDF

12.1 KB
MD5: 5ebf02f817e99e48d8aefff45a69932a SHA-1: edd1bbc2d1c680e1d1fb253d277b4b5c595fa123 SHA-256: b951b9ab59507853c7ec061949e5c6f08d62e723ac057d83f370b316a271a294
96 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The critical ClamAV detection 'Pdf.Exploit.Dropped-78' and the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic indicate that this PDF contains an embedded script designed to exploit vulnerabilities. The presence of XFA forms and embedded files further supports this. The script's exact function is not fully discernible due to obfuscation, but it is highly likely to be a downloader or dropper for further malicious activity. The embedded URLs are not directly indicative of malicious intent but are part of the PDF structure.

Heuristics 5

  • 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
  • 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
6bddbbea2b708c89c5791417f79623204418b5379eb862bc62e3bec25d803b53
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11583 bytes