Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b61a43cf322f4aa…

MALICIOUS

PDF

11.6 KB
MD5: 708ead1a3c9d9c719a2efb04659da9ae SHA-1: cd155d3e6985b60bd6d294770b6835ab5eb378f0 SHA-256: 2b61a43cf322f4aa3d1bb8ef08ac3f5f12ccee60d0b101e8a7b640dc784c38e2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file was detected by ClamAV as Pdf.Exploit.Dropped-78, indicating it contains exploit code. A critical heuristic firing confirms an embedded script payload within a PDF stream. The presence of an embedded file object further supports the malicious nature of the document. The exact intent of the embedded script is not fully discernible due to obfuscation, but its presence in conjunction with exploit detection strongly suggests it's designed to download and execute a secondary payload.

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
156c20b7e3d2882acc9bd273f14da1e0536e01b195ec857d090aa55d17f91685
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11166 bytes