PDF malware analysis — malicious · bafebbed5611d531

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6

MD5: f5612f1307c81ce9e4b350dd35d41994 SHA-1: 45134e6bdb65d28680b5950b0c99f8fc51fa4f6a SHA-256: bafebbed5611d531429f393322be76b0e7dc477b11f7c151bcdcd700a7040444

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of an XFA form and an AcroForm button with an action trigger suggests an exploit is embedded within the PDF structure. The decompressed stream artifact further supports the likelihood of a malicious payload being delivered.

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.

Filename	Kind	Source	Size
`stream_001_off000008ed.bin` `309f5ca34b8a5ffd4767ccfe8631983b1b11d1a6656867140f685da4a3e105cf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1407 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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