Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b28e07b4ec1343…

MALICIOUS

PDF

19.2 KB
MD5: f80c9e537331b5a43fedd7ede7e30c36 SHA-1: 5f46c35bbb26678ce7ffbf72de9d84b9533c40b1 SHA-256: 49b28e07b4ec1343b566e0f79bd7755f4f3594d9ee920241fd29a6ef47215f41
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier with a score of 0.999996 and detected by ClamAV as Pdf.Exploit.Dropped-78. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to exploit vulnerabilities and drop further malware. The document body content is not indicative of a specific lure.

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
bfceb83d91af94afaaf40f28252b4cb9439564d1b9709a223895c1b64d8823f0
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18924 bytes