PDF malware analysis — malicious · 634c41cb60a9fe3b

MALICIOUS

PDF

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

MD5: a63d7d489c188ed5aba11881ef330f6c SHA-1: 78bced69be5da52dfa66cb5310fa94fe264ae6fa SHA-256: 634c41cb60a9fe3b6ef0e4b29c1bcdbdefef44de59612df0f10547d3cc445214

110 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical ClamAV detection and high ML classifier score strongly indicate malicious intent. The PDF_XFA and PDF_ACROFORM_BUTTON heuristics suggest the exploitation of features within the PDF structure. The embedded artifact, stream_001_off000008ed.bin, likely contains the exploit code or payload. The overall pattern points to a malicious PDF designed to exploit vulnerabilities for code execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 5

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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_001_off000008ed.bin` `97391cdef0bcb138a41447dae8bc6c975437f1e5bb53129c7704639cae4c0146`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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