Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4624a5aed765a8a…

MALICIOUS

PDF

19.2 KB
MD5: 18eca427d06c91d8ba9e0283f0b5f311 SHA-1: e97c15be90eb2055fe1b58a506e09dad782cfd61 SHA-256: c4624a5aed765a8a6cbb0650a0f7ddaa43f6e9ffc93658e9f1dcff15aa6c7885
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 classification and ClamAV detection as 'Pdf.Exploit.Dropped-78', indicating it contains an exploit and likely drops a secondary payload. The presence of an embedded script payload and an embedded file further supports this. The embedded URLs, while not directly malicious in reputation, are part of the document's structure.

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
46c442a399b4e39bf411c9a6729d76a0f6ae2218f7787571c906ed176dbfe0f0
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18900 bytes