Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2de67b867e43fee…

MALICIOUS

PDF

11.7 KB
MD5: 1a315550ac2bd605b7f53e505c5b66d3 SHA-1: 4645bda98d2e4dfbcdff04971502a1a5fd2633c2 SHA-256: a2de67b867e43feef7da96658f252d95961b5c406b12d3b99b41b066f4d9bfd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: 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
37c1e07b446e5f187d26cf8e69dcfaa0172a496dfc3c8da53d01dd20b8115a64
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11256 bytes