PDF malware analysis — malicious · 9ed210d642373ff3

MALICIOUS

PDF

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

MD5: cf916b5c31b1b68e4d772547ef0fd36d SHA-1: ccc5eb96a92985f2ff37297a02349a0bf023955c SHA-256: 9ed210d642373ff3300dc844926f8e69a56d854605bf1d60b02c3fedbeeeec9c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript and utilizes JBIG2Decode and ASCIIHexDecode filters, which are commonly associated with PDF exploits. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to download and execute a secondary payload, as suggested by the heuristic firings.

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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