Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a9ec0535712865…

MALICIOUS

PDF

19.2 KB
MD5: d1f24b4b93e2adb4e2196b72f5e93dbd SHA-1: b7aba79d4637a087e8eba5d67a42a558438af47a SHA-256: a8a9ec0535712865d90affc46e646b2c5fc6b1d2fd77a3c1c6d642f25964fcab
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection as 'Pdf.Exploit.Dropped-78', indicating it contains an embedded exploit and payload. The presence of an embedded script payload and embedded file further supports this. While the document body is obfuscated and does not provide clear user-facing lures, the technical indicators strongly suggest 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
018fb72f4bca977a008801ae3efe28318bf8e4437073440508bc696ef1dd12d3
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18886 bytes