Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b6e70a50083a02…

MALICIOUS

PDF

11.8 KB
MD5: 0844c825c6990ea890ff13b2c6365166 SHA-1: ead360853e41419aa75926ba8594d88dd55aab06 SHA-256: b5b6e70a50083a020725196565c4af6e29e0e957f9e18f7d7aea196365495e33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF was flagged by a machine learning classifier with a high probability of being malicious and was also detected by ClamAV as Pdf.Exploit.Dropped-78. The presence of an embedded script payload and an embedded file further supports its malicious nature. The document body contains obfuscated content, suggesting an attempt to hide malicious actions.

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
86d7de4679b8895fa4de235f8bc8b151e97eced2d71d230405842a756f16a268
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11321 bytes