Malicious PDF — malware analysis report

Static analysis result for SHA-256 c738b244265374b1…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 20604b3391dfbc40956aa66871c7d52f SHA-1: 9e0c8c5eb1b8dcaaa596bc197f311a03ae190d80 SHA-256: c738b244265374b1a94c43b6aca1dbc8eabaca35a1c1cdb36c59f2e9a8b0f1a4
110 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36874' and an ML classifier indicating maliciousness with high probability. The presence of XFA forms and AcroForm buttons suggests an attempt to leverage interactive elements for exploitation. The embedded artifact 'stream_001_off000008ed.bin' likely contains the exploit payload. The document body text is garbled, indicating it is not intended for human readability but rather to facilitate the exploit.

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
e047886209149a1ea65ae3412ead7e4edb0e46b85b3b041ae3ae6c64c68f96d6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1442 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).