Malicious PDF — malware analysis report

Static analysis result for SHA-256 1189b04b8dd99369…

MALICIOUS

PDF

19.3 KB
MD5: 300d3d3587898afb6c9cfc5fec8cfc03 SHA-1: baa88636705056353016a4448da9cc823f9bf8eb SHA-256: 1189b04b8dd99369647a3f49e5b2ae5709ba3f95795246f8891931baa8ccfa8f
116 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV detection as 'Pdf.Exploit.Dropped-78', indicating it contains an exploit. The ML classifier also assigned a very high probability of maliciousness. The presence of an embedded script payload and an embedded file further supports its role as a dropper. The benign URLs present are likely unrelated schema references within the PDF structure.

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
8aec86475f6d73baf97e4bbdadc0b95e86bab8f9a02d74410a169c313dee9b9b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19040 bytes

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