Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9d9834e699a251…

MALICIOUS

PDF

9.9 KB Authoring application: Nehminkcwjcvboq Zsudntufmryzlam
MD5: 99747e0c95907dff51af5b86dd4d4e3f SHA-1: 5774a538041f22cdfa977741b724d66628871441 SHA-256: 5f9d9834e699a251bfcab9e9105b8d4ee4f6eec3edddad1e0d34a7c5429d928e
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-88'. The ML classifier also returned a very high probability of maliciousness. The embedded script likely attempts to download and execute a secondary payload from the unknown URL http://ambrosiaaz.in/file.php?tdh661=1834&quot, using the embedded file 'embedded_file_obj0008.bin' as part of the exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-88 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-88
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://ambrosiaaz.in/file.php?tdh661=1834&quot
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
20b8b59992d45e6f341df62a3ffbc630daede22442fc30b880a1daec0f9c915b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xF1 8994 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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