Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c298e34e370e09…

MALICIOUS

PDF

10.4 KB
MD5: eee857c5b29ea5d0a74e4eb73a42a7ef SHA-1: 1a9c7c7e72173244644787300c4d5835cb0920d2 SHA-256: 44c298e34e370e0901518dc1c2f93fe7454c4d371a3209a4df637fe10960aa2a
108 Risk Score

Malware Insights

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

The file is a PDF that has been flagged by multiple heuristics, including a critical ClamAV detection for obfuscated objects and an ML classifier indicating high maliciousness. The presence of an embedded file further suggests a delivery mechanism for a secondary payload. The document body is unreadable, but the combination of PDF obfuscation and embedded content strongly indicates an attempt to exploit vulnerabilities or trick the user into executing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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
embedded_file_obj0001.bin
9cf4345faba0c7964fa7a12a43ed4855cc523e6520d50c8a736cfb3b9d76a8ec
pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x8A 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).