Malicious PDF — malware analysis report

Static analysis result for SHA-256 be68a04a3d4bc830…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: cc5a7024e4cc86e7b1b4c213841fd9dc SHA-1: 8646be7428569116c910d23bfbfa2ecee4238b80 SHA-256: be68a04a3d4bc8307eb313d7d2acefa0f9058b17d6152ce5ad1f3714fa99181b
110 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36874. ML classification also strongly indicates maliciousness. The presence of XFA forms and AcroForm buttons suggests an attempt to leverage interactive elements for exploitation. While no specific script was extracted, the overall structure and heuristic firings point towards a classic PDF exploit delivery mechanism.

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
02cc6bd2601a452f5a5e8d5c7c889563e0a4287d6253f28e6dba02ee0794a742
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1432 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).