PDF malware analysis — malicious · 05f64217ebc380a9

MALICIOUS

PDF

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

MD5: 8dc22c663f21556d7e0ca4a61c9bc2cd SHA-1: 305817ff9e3a1141fbd53f76aaf41bd29516ee67 SHA-256: 05f64217ebc380a9c398d72ec7743beda29bffed5694671aebca78aa6c3b5822

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript and utilizes XFA forms, triggering critical heuristics related to PDF JavaScript exploits. ClamAV also identified it as Pdf.Exploit.Agent-36859. The presence of these exploit indicators strongly suggests the file is designed to execute arbitrary code, likely to download and run a further stage of malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 9

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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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