PDF malware analysis — malicious · b6c3146e1182f02e

MALICIOUS

PDF

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

MD5: 9fb693e086636731b9b531d420a17a84 SHA-1: 699b50dc606bdc121952f8a6ae599af6955096e4 SHA-256: b6c3146e1182f02ebc231208e2df75a1f872e41582c35e7832502ee2fd94b5e3

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF sample was flagged by a machine learning classifier and ClamAV with a critical severity heuristic, indicating a high likelihood of malicious content. The presence of an XFA form and an AcroForm button with an action trigger suggests an exploit is embedded within the PDF structure. The ML classifier output of 0.999296 further supports the malicious verdict. The embedded artifact 'stream_001_off000008ed.bin' is a suspicious, long encoded blob, typical of exploit code or shellcode.

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` `c614d6beea18b6a6150844eccc13d384b042e915e828f87630196c171e4048ee`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1490 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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