PDF malware analysis — malicious · 1a55c5ea637a4c9b

MALICIOUS

PDF

37.7 KB

MD5: 021793b96f2b004b518a3225fffc0fa3 SHA-1: 4e68195249908b4477ffac143e3bc99c7f4ca27f SHA-256: 1a55c5ea637a4c9b510e795fa879127caabdea665e5a908ac957a947138c5d86

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1559.002 Component Object Model Hijacking T1204.002 Malicious File

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript, a Flash object, and the use of string concatenation for obfuscation. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, identified as 'javascript_obj0006_000.js', is likely responsible for executing the malicious payload, potentially exploiting vulnerabilities within the PDF reader or delivering further malware. The presence of these elements suggests a sophisticated attack designed to compromise the user's system.

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 0xAC5	55839 bytes
`javascript_obj0006_000.js` `590f8c4aa01c96f7a66b8098a9d9639c0a9886ba9549ac5567df5b54ac05a447`	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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