Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf8dbe365f04c36…

MALICIOUS

PDF

11.9 KB
MD5: 90f83cef0317f579e08e86b43d95b9b7 SHA-1: 26d5f9052f1c587b2dbdf0875155e2efe6c4159c SHA-256: 3bf8dbe365f04c36e7f84ccd6d93aa7711f19e034c96600ec85c3f746bbe5c42
96 Risk Score

Malware Insights

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

The PDF file was detected by ClamAV as Pdf.Exploit.Dropped-78, indicating it contains an exploit. Heuristics also identified an embedded script payload within a PDF stream and an embedded file. While no specific URLs were flagged as malicious, the presence of an embedded script payload strongly suggests the PDF is designed to download and execute a second-stage payload. The exact nature of the script could not be determined due to obfuscation.

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
b1aa4f09fb03cbdae8fb195d93b2276075d9cba314bea6cf49d04f41dc82d556
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11461 bytes