PDF malware analysis — malicious · 1851f98a88cb3f51

MALICIOUS

PDF

31.2 KB

MD5: 97cdc5154b523800c0f60116c7fd4954 SHA-1: b6e3137eb9eebbffdf4bfe693318ee58ff97360d SHA-256: 1851f98a88cb3f5199f02649af1d14667427a369cd6fca5eef60f318e37127b5

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript that is heavily obfuscated but appears to be designed to execute a Flash object (TyPWoIJRMY.swf). The JavaScript uses an eval() call, indicating dynamic code execution, and the presence of PDF_JS_EXPLOIT_CLUSTER heuristics suggests a known exploit pattern. The ultimate goal is likely to download and execute a further payload, as indicated by the embedded files and exploit cluster.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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 0x11B5	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` `c19fa021a7979ac13eb2b8015c546523c48fbd94e3681964d9b26387ef9ae35c`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3436 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` `c3e1318725af9354181429c464cfa70dd636f32a2200ce8c71a5733c2da0d6fb`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDB1	2101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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