Malicious PDF — malware analysis report

Static analysis result for SHA-256 79407b44aa58384e…

MALICIOUS

PDF

11.7 KB
MD5: 148def76b5cdd8af7827feadd905d504 SHA-1: 9923fb19662afdfd284b3cf348fd1d9af39d567b SHA-256: 79407b44aa58384e0e887d822c028dacb32da2cdf0a76dc870b0c7417651af3c
116 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78'. The presence of an embedded script payload and an embedded file strongly suggests that this PDF is designed to exploit a vulnerability and execute a secondary payload. The benign Adobe and XFA URLs do not appear to be directly involved in the malicious activity.

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
f554b81d12ca68f581a46064a11ca85966d84eede6a4510428a00a8edd8ea3dc
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11236 bytes