Malicious PDF — malware analysis report

Static analysis result for SHA-256 43497521e656b2e0…

MALICIOUS

PDF

12.1 KB
MD5: c99476f77a58f3b2721203008937799e SHA-1: ef87e0e516e65ae8880f9fe7890f7a4e42d15235 SHA-256: 43497521e656b2e094e81c5db4702f5280f3baa33c74559329f1a74742c0fd89
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of an embedded script payload and an embedded file suggests the PDF is a dropper or exploit document. The embedded URLs, while not directly malicious, are part of the PDF structure. The ML classifier output of 0.999995 strongly supports the malicious verdict.

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
d9e6be2e5dd89452893dc43ac3cdc0e8e198e29132c448d6c481252708aecdef
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11673 bytes