Malicious PDF — malware analysis report

Static analysis result for SHA-256 634fbe0265bf71d5…

MALICIOUS

PDF

11.7 KB
MD5: aedf6139432c4560bffc99cd3e289585 SHA-1: 769fa4eaba1fd7ea798ad228c8f3ff3b082691df SHA-256: 634fbe0265bf71d5629c87f376a9c5abb96ce2b17ed40d0e979ab68a31d19d29
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 vulnerabilities and execute a secondary payload. The ML classifier also flagged it with a very high probability.

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
5f61ad9a3307afa2ecbd4bdc744065d38813534082a3ab4865b4bd56a3f9942b
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11181 bytes