PDF malware analysis — malicious · fd11988535f7bc33

MALICIOUS

PDF

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

MD5: 15759644d45876422a353f3800f61937 SHA-1: 2e881ed045e9931ad4a23c582b82c09c45c09bd9 SHA-256: fd11988535f7bc3303c74091c665e5739a94501bd169beb93dada62418d65c33

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File

The file is a PDF document flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36874'. The ML classifier also strongly indicates maliciousness. The presence of XFA forms and AcroForm buttons suggests an attempt to exploit PDF viewer vulnerabilities, likely leading to arbitrary code execution.

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` `d3b481a8271f363983c955ed1bb1e36ae5c21c60e5aa4e0fcf95178d7a623d30`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1425 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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