Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d9c71cae7cc7a6…

MALICIOUS

PDF

12.0 KB
MD5: 1984aedc6b8ac4d0bc711cdf29962c1b SHA-1: 460ecf2e9880e19d19a650316f57040fadb872fa SHA-256: b4d9c71cae7cc7a627f0b9d5ff781d78bd005a3964d0e354364372b3468e37c9
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection as Pdf.Exploit.Dropped-78, indicating it contains an exploit and embedded payload. The presence of an embedded file and script further supports this. The document body contains obfuscated JavaScript, likely intended to download and execute a second-stage payload, though the exact functionality is obscured.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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
28b325caabe7ff08f7bd9c525ca2e0909fc188e8ade8e495a5255e4a97a85a7b
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11580 bytes