Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f2b719730bfeb5…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 2c4ff2a83b03aed55cfa568e7864714a SHA-1: 28dfcecea5c7e7be1d94efdc4aa81ae0d3ae6de4 SHA-256: 49f2b719730bfeb5991c5494e32cb6292607bbbbd61b414676de2ccc7ac80433
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The file is a PDF document flagged by ClamAV as Pdf.Exploit.Agent-36874, indicating a known exploit. ML classification strongly supports this, and the presence of an XFA form and an AcroForm button with an action trigger are common components in PDF exploits. No scripts were extracted, but the file's structure and heuristic firings point to a direct exploit embedded within the PDF, likely leading to arbitrary code execution upon opening.

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
15caf06a41feb6a986f380d48f1f40bab984cea32ec011b577c76908cb808d4d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1462 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).