Malicious PDF — malware analysis report

Static analysis result for SHA-256 a988e240f1999acc…

MALICIOUS

PDF

19.1 KB
MD5: e6bb8e8b968fa4266209d0082d337df3 SHA-1: a9ef4446c028eb1aeab50c70130a4b936586a6f3 SHA-256: a988e240f1999acc34d7bc77a85001a765de0f0ea9ff2b8b52ea62f718435c87
128 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it contains exploit code. The presence of an embedded file and XFA form suggests a common PDF exploitation technique. While no specific script was extracted for detailed analysis, the embedded file is highly suspicious and likely contains the secondary payload.

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
e09472920e0cdae8c7d2ec134964f9ec9e3b1292f88b0f4279e149cb3a84a0f3
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18809 bytes