Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d59de07d137c89f…

MALICIOUS

PDF

12.0 KB
MD5: 2525abdf5a82cd5fc98d7fb628189ca2 SHA-1: 40f3b366ab5d93f5b07982c8f2e20019cd931cc6 SHA-256: 4d59de07d137c89f88c1766b0b76f9d9d41a6899e9577ba7c28e5c4376d4d5ba
128 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV with the signature Pdf.Exploit.Dropped-78. It contains an embedded script payload and an embedded file, indicating it's designed to exploit vulnerabilities and drop further malicious content. The presence of XFA forms and embedded scripts suggests a complex attack vector.

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
edd49c179a579ff63145534b05e2602344bb35f5f79f7217338d9881f660bdb9
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11582 bytes