PDF malware analysis — malicious · 38a575aefffc0c42

MALICIOUS

PDF

29.8 KB

MD5: 376d2738cf417ac49d91b4afb38eea32 SHA-1: 157d4e01af2ff53ae169ae41544c3f7de7e89fab SHA-256: 38a575aefffc0c4224374ecd2643e71a2fe0ebbb49c996d1d74cd190d67a9f76

112 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and a Flash object (test.swf). The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, suggests an attempt to execute code. The embedded JavaScript file 'javascript_obj0006_000.js' is a key artifact that likely contains the malicious logic, possibly for downloading further payloads or exploiting vulnerabilities. The confidence is high due to the ML score and multiple heuristic firings, but the exact payload and execution method remain unclear without deeper analysis of the script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`test.swf` `4d4d42d908c48737d0cbe1f33c14f197803950e6ff47f9c0f13e1d51a231494d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x8C8	53991 bytes
`javascript_obj0006_000.js` `8483c12569e759d4dde31dda283e816729d9b6965c7b8681669d8716d4943eb8`	pdf-javascript-stream	PDF /JS object 6 at offset 0x106	11498 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 239 eval/decoder/string-building token(s).

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