Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff6ca9c594a91f0…

MALICIOUS

PDF

12.0 KB
MD5: a3de57cab9f755989b130e6c8e25390f SHA-1: 8913f70466cf873a7c5065a5846cd3ecb0543e5e SHA-256: 4ff6ca9c594a91f053114df2075773c287be524e88ceeea2b23c2b4e3e294c6e
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically identified as 'Pdf.Exploit.Dropped-78'. The presence of an embedded script payload and an embedded file further supports its role as a dropper for malicious content. The XFA form suggests a potential exploit vector.

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
c029ece8fe918821a1fc0edda8f6d7aafeb10c27ee8a3da069bdf0e08d7d7587
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11577 bytes