Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f98fe46b0392b21…

MALICIOUS

PDF

10.3 KB Authoring application: Fzlfrlaujg Uqcaktqgm
MD5: 074d51acb1f325fa3d926e75af0e50e0 SHA-1: 2e289a75848c00c9266e423986b328a9b6004bf9 SHA-256: 4f98fe46b0392b216181d00e5b896887f1082c078424067fe6b8858050e7a0a6
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded script content and is flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-87'. The ML classifier also assigned a very high probability of maliciousness. The embedded script likely downloads and executes a second-stage payload from the suspicious URL found in the document. The document body contains obfuscated JavaScript that appears to be responsible for this malicious action.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-87 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-87
  • 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
  • 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://www2.powerrs-suite.it.cx/?4c639cmy=WMajl3bI5d6W5ODJr6qjYqOb3ejRcZNnl27FoKqp0KrHmObmaqSom62ebZVua3GJ2eytoKeVqZjUj9XnpseyeImmnJ2goJ%2Fjkw%3D%3D&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
038b7587d255ea7d250b4c68063572d09d16eb885394848c6e9e66b7dac4f3a0		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x141 9449 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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