Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfab08754eacc86d…

MALICIOUS

PDF

19.1 KB
MD5: bf3aa23294fd72c58cfcf76bfddf9f0d SHA-1: ad1b5c91f3dc53a9639a09c70543244cebd6646b SHA-256: bfab08754eacc86d01978e2debe52e281283bca9fae68a53c45ad9389c951903
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The PDF file was flagged as malicious by multiple engines, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded script payload and an embedded file suggests the document is designed to download and execute a second-stage payload. The specific embedded file name 'embedded_file_obj0008.bin' is noted as a potential indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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
cd86e8ea551f466bb10fcda0a89ef821fa0dc3f8bfb850cadb462af5faeba778		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18847 bytes

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