Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c8e4a9cee14ece…

MALICIOUS

PDF

11.8 KB
MD5: 096ce15f379002845a4be17aab665ef0 SHA-1: 12f4548faed15454e4784a0f36a211f7a9a8234b SHA-256: 57c8e4a9cee14ece25a16fcba7926240495890535875aafc945b1fc47bac1684
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78' and a high ML classifier score. The presence of an embedded script payload and an embedded file further indicates malicious intent. The PDF structure also suggests the use of XFA forms, which have been historically exploited.

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
3fd997e078fabe8c63005966bf337d1dcb3353607565a13e8f8ada8107adcef8
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11325 bytes