Malicious PDF — malware analysis report

Static analysis result for SHA-256 145b119f38034cd2…

MALICIOUS

PDF

19.4 KB
MD5: 9f05cf3c227ffaa4526ab4a22a3fcf41 SHA-1: f543aa2ffd4aa8f5461efab8a3952dbb44e367f1 SHA-256: 145b119f38034cd27509e14f9229525ae789f069486258e3b80777b7d58bf5b9
116 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains an embedded script payload and an embedded file, indicating it is designed to exploit vulnerabilities and deliver a secondary payload. The ClamAV detection 'Pdf.Exploit.Dropped-78' further supports this assessment.

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 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 script payload in PDF stream low 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 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
e04bee3e9678977178caa74de9a8d94e8f1a535e0cf7cac823580433d7d2b80e
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19078 bytes