Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fe30b55f074f92…

MALICIOUS

PDF

11.8 KB
MD5: 20c4286690fcc6a6d5d968092c022eb2 SHA-1: 0ad732c85d614fbb4ddf68ead02fa1038475642a SHA-256: b5fe30b55f074f9200bf7dfd56e14457dd7f3911bad18ed6a9cc073234377fd2
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78' and a high ML classifier score. The presence of an embedded script payload and an embedded file further indicates malicious intent. The PDF structure and embedded content suggest it is designed to exploit vulnerabilities and deliver a secondary payload.

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
ba7d87751185d3c5ea00fa1ae537d9b0a82078288a3995650c6a0812504a03f7
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11323 bytes