PDF malware analysis — malicious · c81511bed0757c79

MALICIOUS

PDF

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

MD5: 68104f05faa95219b1d9a575cc108450 SHA-1: f0f547aa7a39444a8bc405b533104507b3da88b8 SHA-256: c81511bed0757c79ffb01f791ef388cca44d748108a28e15f0b99218f18ebd5c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and utilizes JBIG2Decode and ASCIIHexDecode filters, which are often associated with exploit delivery. ClamAV detection as Pdf.Exploit.Agent-36859 further supports malicious intent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though its exact functionality is obscured by the PDF structure and encoding.

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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