Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5d5bf506101510…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 2dc0cd3a9946ccb66366c27aaf14a8ef SHA-1: 102acab4e4ba2fcabb839f0c974dfd1b0549baa1 SHA-256: 7e5d5bf50610151084b2e3c2f3acbc7404485f2a2b3472d73e9971843b2079e2
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an XFA form and an AcroForm button with an action trigger, indicating it is likely designed to exploit a vulnerability within the PDF reader. The embedded artifact 'stream_001_off000008ed.bin' is a decompressed PDF stream, further suggesting the presence of exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-36874 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36874
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://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
stream_001_off000008ed.bin
b62d3b2ed30aec4feadac1ee8552f10303223cd939ef2e7bf076323fccdf2cdd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1414 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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