PDF malware analysis — malicious · ca9990e6831536be

MALICIOUS

PDF

31.6 KB

MD5: dcf56709596c4642dd2a40965fd7afe2 SHA-1: 5e5e41f596168db74dc7938df2763cfaccd60ead SHA-256: ca9990e6831536bed7e9a877447560af97f9f477412587c0c6fb6ba779cf5339

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious JavaScript

The PDF contains embedded JavaScript and a Flash object (TyPWoIJRMY.swf), both flagged as suspicious. The JavaScript stream and deobfuscated JS indicate the use of eval() calls, a common technique for executing arbitrary code. The ML classifier strongly suggests malicious intent. The primary attack vector appears to be exploiting PDF vulnerabilities to load and execute the embedded Flash content, which likely serves as a downloader for further malicious stages.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`TyPWoIJRMY.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x1370	26993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `1f4a1bf80660ebefc402e353c9bb358229ead0334ad4e6edf9bb05692202e146`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3879 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d558b2ed04c584bdc08b71c309f8d81547653320541ed7e3fa4336016c8d3fe2`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDB1	2503 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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