PDF malware analysis — malicious · a606482f47eb200b

MALICIOUS

PDF

37.7 KB

MD5: 01b65f1ee94b2a1d50c51142ef7cffa3 SHA-1: 9d9c24edfbf6566d6ca67b3c16ce2c7f258d61c6 SHA-256: a606482f47eb200b934ca237da96122e530a8c617d625bd61101e3690e2e8f94

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and Flash content. The ML classifier strongly suggests maliciousness. The presence of an embedded JavaScript file indicates an attempt to execute code, likely for exploitation or payload delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to the user-facing lure.

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 0xAC9	55839 bytes
`javascript_obj0006_000.js` `0775489dba64ebc9116510215a015f8e352549cb4e41b328599a5fb053102f21`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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