Malicious PDF — malware analysis report

Static analysis result for SHA-256 af810d5ad70efcc3…

MALICIOUS

PDF

19.1 KB
MD5: 25f074673a71b90b40ac5fd961d3f698 SHA-1: 4d7bf881ddd31caeb7f0b8418c5caa9bee49f04a SHA-256: af810d5ad70efcc367f1536d1a7a864e78c8d422a05e8e894591ac1d0c4f8a0d
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.002 Phishing: Spearphishing Attachment

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports its malicious nature. The ML classifier's output of 0.999996 strongly suggests a malicious exploit is present 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 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
e128d6d33a64322d98a43b35299680fbe38c8796593a190b8abb92f043cceacf
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18780 bytes