Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab3bb71595624f…

MALICIOUS

PDF

19.4 KB
MD5: e9feee2da3a6d812b886f45b14129a62 SHA-1: 1378de8ffcb73c2468649b0ebc0455b9fe79d69a SHA-256: c4ab3bb71595624f3fffc197771798ae4c0890542f70f050684d5f688b6e7782
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection (Pdf.Exploit.Dropped-78). The presence of an embedded script payload and an embedded file indicates an attempt to exploit vulnerabilities and deliver a secondary payload. The document body content is not indicative of a specific lure, but the overall structure points to a malicious exploit delivery mechanism.

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
764452c83e16ed539a059132f9cc07939b4657ecb8ef271c7cdbe99e2fb4e877
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19060 bytes