Malicious PDF — malware analysis report

Static analysis result for SHA-256 353e3a071f5a0a78…

MALICIOUS

PDF

12.0 KB
MD5: f7e5739805c4fe329513df34c250b85c SHA-1: a059eb19443092d3e1af1c53737a5f8dbba1ae62 SHA-256: 353e3a071f5a0a7875816eac2118376384fbfdd0ec33e5af554d1404e94be055
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML score. The presence of an embedded script payload and XFA form suggests an exploit attempt. While no specific script content is readable, the overall structure and detections point to a malicious PDF dropper.

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
e52873ca470cc27eccb78d1a4091f5038d71492f8427d6c0e0f828f3daea2f78
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11552 bytes