Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fb4dfefb17c555…

MALICIOUS

PDF

26.2 KB
MD5: ed5279213237b74a158583f35b11435a SHA-1: ced0b02623f360f25b0f11cf6a3c051ad0843109 SHA-256: a1fb4dfefb17c555fd5711faac8282b4e050249ea8a53e04654d438cc8a529ec
128 Risk Score

Malware Insights

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

The PDF file was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it contains a malicious exploit. The presence of an embedded file further supports this assessment. The embedded file, named 'embedded_file_obj0008.bin', is likely the delivered 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
d9b42987935351660ce47f69d9bc184841c821b0e15f24d22a007d6fe3ccc0ce
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 26023 bytes