Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5eff453aa6425e…

MALICIOUS

PDF

11.9 KB
MD5: b7e5cf6f505c29b5d6490d1067c8abd8 SHA-1: b72b701c9a31c1ed36e162edd7cf1cc9edad4fa4 SHA-256: cd5eff453aa6425e4f29a3f61bbf5d9928a1225348788b2af1470ecde1b83ade
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 heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78' and a high ML classifier score. The presence of embedded script payloads and embedded files strongly suggests it's designed to exploit vulnerabilities and drop further malicious content. The embedded URLs are not directly indicative of malicious activity but are part of the PDF structure.

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
3a57fe248fed6564e843fdecd8aa104d13f83ab3696b6c5e4577257fcec8c52c
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11467 bytes