Malicious PDF — malware analysis report

Static analysis result for SHA-256 615becb90b079b49…

MALICIOUS

PDF

19.3 KB First seen: 2026-05-09
MD5: f04d90f690b8f64b32ec99f42e472bcc SHA-1: 87598ef77772339b5e54cec1cb4a48773caf9240 SHA-256: 615becb90b079b4989a1e130324c62cc8161a43ea6bbf2ff5cc6322db4469415
130 Risk Score

Malware Insights

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

The file is a PDF with multiple indicators of malicious activity, including malformed streams and embedded script payloads. ClamAV detected it as Pdf.Exploit.Dropped-78, and an ML classifier assigned a very high probability of maliciousness. The embedded script likely attempts to exploit a client vulnerability to execute a secondary payload, consistent with a spearphishing attachment.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 info 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/ In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19031 bytes
SHA-256: 5782f794d6b4ef2d28fdaae4dba74bc7e3dcbe0f80f2696f4636b153430b7e97

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