PDF malware analysis — malicious · 52fdf2307bdb4f98

MALICIOUS

PDF

31.4 KB

MD5: 1291ca9fc932597dc86cb143a5994b8c SHA-1: aae5388de7df344d1c64acb17e4842fb2ea68a77 SHA-256: 52fdf2307bdb4f98850af06354797f607800f773807011b265d0f1baaf6cbc61

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and Flash content, as well as high-confidence machine learning classification. The presence of JavaScript actions and embedded JS streams, combined with the 'ML_NYX_PDF_MALICIOUS' heuristic, strongly suggests the document is designed to execute malicious code. The embedded SWF file further supports the likelihood of a multi-stage attack. The extracted JavaScript file, 'javascript_obj0006_000.js', is a key artifact for further analysis.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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 0xF6D	53991 bytes
`javascript_obj0006_000.js` `be1c7913847fd026d20e7d117a689ca759022c156e3ebc0ea41ad0aab20cd3f8`	pdf-javascript-stream	PDF /JS object 6 at offset 0x106	10955 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 239 eval/decoder/string-building token(s).

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