PDF malware analysis — malicious · 900965a8643db2d1

MALICIOUS

PDF

4.4 KB

MD5: 3809d3140d4c55d04d920cb5f420cbe5 SHA-1: 8a402e3bba4fcabcaa9095e1f15f34b00638130e SHA-256: 900965a8643db2d1e9b8605cfea45379ecf3d596aeb5ce4cea26e7abd03047fe

132 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript and RichMedia (Flash) content, indicated by multiple heuristic firings. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is likely responsible for executing the exploit. The presence of Adobe.swf in the document body suggests an attempt to leverage Adobe Flash Player vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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
`javascript_obj0006_000.js` `25d4ca400e81b2d8dc24197118c3f7a955806e6dd771ce9f2faef54afc0bb7b1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x105	10458 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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