PDF malware analysis — malicious · 1a495417175c1804

MALICIOUS

PDF

37.7 KB

MD5: 1411721f58d2265afc43df8c17056b4f SHA-1: 349259f8a85ccdeb2c9c7c8c726c77fb3d58a391 SHA-256: 1a495417175c18047ecdbb40f4ccd6a508ccee8ff4c632b63538adf54ac90d6c

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1559.002 Component Object Model Hijacking

The PDF contains embedded JavaScript and a Flash object, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. The ML classifier also flagged it as malicious. The embedded JavaScript file, 'javascript_obj0006_000.js', is a strong indicator of malicious intent, likely to download and execute a second-stage payload. The presence of ASCIIHexDecode with exploit indicators further supports this. The exact functionality of the script is not fully discernible due to potential obfuscation, but its presence within a PDF is highly suspicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`Adobe.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xACF	55839 bytes
`javascript_obj0006_000.js` `922efebf68076f0330620f98f3652c7bb8f1a3569628268cf94e2d9bf966be27`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1588 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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