Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f9a4e6057bf5c5…

MALICIOUS

PDF

15.2 KB
MD5: 0567213dc7598bc3063839ea541d370c SHA-1: cde0461a9c3ce4ee669426632a9f25cc7465d9b3 SHA-256: a1f9a4e6057bf5c58517c61be576cae8b09860dc7ac77e7b96d92d189dc72403
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 (Pdf.Exploit.Dropped-78) and a high ML classifier score. The presence of an embedded script payload and an embedded file further indicates malicious intent. The PDF structure and embedded content suggest it is designed to exploit vulnerabilities and drop a secondary payload.

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
1b07455c66e68c78695d04427ea74ccb02cdb6dde6a437a524e378f49e0bdb62
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 14819 bytes