Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef9867546650943…

MALICIOUS

PDF

19.2 KB
MD5: 3e30d9a109eb881012f50116dbd70fd2 SHA-1: b2a9925ca874f7e48ed8d1a68d43c2b8ba11fe1e SHA-256: 7ef98675466509435a7fd0b449c5eb634440b4658521be6927a53fd1997fbb84
116 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Exploit.Dropped-78 and a machine learning classifier with high confidence. It contains an embedded script payload and an embedded file, indicating it is designed to exploit a vulnerability and deliver a secondary payload. The benign URLs present do not appear to be malicious.

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 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 script payload in PDF stream low 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 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
16b9c5c753bf01c2ee108b5d44835a477ae55560dc267b3a8f5ac718f0ddd7bb
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18890 bytes