Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf5a1f5ea05c8f6…

MALICIOUS

PDF

12.0 KB
MD5: 67c9dabe7acc3af6d649f0f32ed0ad9d SHA-1: f8379d140deef93f4c1f93f4705c560f0b5c7fe4 SHA-256: 7bf5a1f5ea05c8f64bf7d4317b73d1862841decbc97479d63ee7472e07116445
96 Risk Score

Malware Insights

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

The PDF file contains embedded content and an embedded script payload, as indicated by the PDF_EMBEDDED and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. ClamAV detection as Pdf.Exploit.Dropped-78 further confirms its malicious nature. The embedded script likely attempts to download and execute a second-stage payload, although the exact mechanism is not fully detailed in the provided heuristics. The embedded URLs are related to XFA forms, which are often exploited in PDF-based attacks.

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
b008f241e3672f0489a572dac8981f900335abfec76841b71107e071dfa6d4e8
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11504 bytes