Malicious PDF — malware analysis report

Static analysis result for SHA-256 054f4557a28306ed…

MALICIOUS

PDF

12.0 KB
MD5: cef440bc524df65b5c255bd5fc8eb619 SHA-1: 361c8997bf8d8c775ac49c2f438bf3556373c0eb SHA-256: 054f4557a28306ed5a1eaa623955ce92b6b8ab43ea369b72d8f9132d2cbdebf4
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 ClamAV and an ML classifier, indicating it contains an exploit. The presence of an embedded script payload and an embedded file suggests the document is designed to drop and execute a secondary malicious payload on the victim's system. The benign URLs do not appear to be directly related to the malicious functionality.

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
d6eac523ec129c84d9a81b148b99acaeb43f7e80e0069c3f8d42ea03723c0580
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11543 bytes