Malicious PDF — malware analysis report

Static analysis result for SHA-256 281a274fd46f34a6…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 9c91609db95e1d1afec1abfec0beac2e SHA-1: 4fb5721aaea9de658a0ade62cb9e9c185c5d39a7 SHA-256: 281a274fd46f34a629ae6ca29f0925e727128eaaf76e66ba164506282fc9b328
108 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identifying it as 'Pdf.Exploit.Agent-36874'. The presence of XFA forms and AcroForm buttons suggests an attempt to embed interactive elements that could trigger exploits. The ML classifier's high confidence score further supports the malicious nature of the document, likely designed to exploit a PDF reader vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off000008ed.bin
c2fef2d56e75c749b1c58ccd200a7c0796bb782072e629e0ec4a7031a4e6f958
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1469 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).