PDF malware analysis — malicious · f65432d6b844b3cd

MALICIOUS

PDF

18.3 KB Created: 2011-01-20 15:30:08

MD5: cbe21e068a3564de205beb291b8bf473 SHA-1: 1f92a07f3aa7a78c0e5656159a497c8d688bab56 SHA-256: f65432d6b844b3cd362622962d74ca6fe4468dd26169aac6218010864c484164

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ML classification and ClamAV, which detected it as 'Pdf.Exploit.Agent-36859'. Heuristics indicate the presence of embedded JavaScript and exploit-related filters (ASCIIHexDecode, JBIG2Decode), suggesting an attempt to leverage a PDF vulnerability. The ML classifier's high confidence score further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 8

ClamAV: Pdf.Exploit.Agent-36859 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36859
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`jbig2_00_off000028ca.bin` `833fe8ec86289306ecbc0f0d08aa0c6de1e14eb3bb09ac4adcbe2577458bae17`	pdf-jbig2-stream	PDF JBIG2 stream (Flate-decoded) at offset 0x28CA	6161 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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