Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20539d38f23ff98…

MALICIOUS

PDF

15.7 KB
MD5: c67bab98111ecb7e72cfd26bce7556e1 SHA-1: b07811a40244437902ee7e84528bf0952965f249 SHA-256: d20539d38f23ff989c75c19abc7cbcb9a454a9f53f6dee3572a140eae5242eae
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple high-confidence heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Dropped-78). It contains an embedded script payload and an embedded file, indicating it is likely designed to exploit vulnerabilities and download a second-stage payload. The presence of XFA form elements and embedded URLs, though some are benign, are common in PDF-based attack vectors.

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
6a0d24d2065d9c4014c5a8560f81d2cbd6c9b7afad6a5366ee845352c1b22bc2
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 15357 bytes