PDF malware analysis — malicious · 1f28bd3b5e089304

MALICIOUS

PDF

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

MD5: 1e3387fb3e1b26e7887e27367c9922f0 SHA-1: 2b38e200e0749606f24224b4ded565c540c3f466 SHA-256: 1f28bd3b5e0893040cad562b314121b2107d0d24ead0ccfea6f9b119b17442a4

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as Pdf.Exploit.Agent-36874. The presence of an XFA form and an AcroForm button with an action trigger suggests an exploit is embedded within the document structure. The ML classifier output of 0.999296 strongly indicates malicious intent, likely to exploit a PDF vulnerability and download a second-stage payload.

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` `c639ddba7dda0b4d7599056a752af965136b9e5221ca3cc57fb5d437ef182d57`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1436 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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