PDF malware analysis — malicious · 142d641ea2ee908a

MALICIOUS

PDF

2.7 KB

MD5: 664a14ba6f6baf6de5a213fcf3683952 SHA-1: 863c31e8e59e7e3d953ed91d318ca71066aaa73d SHA-256: 142d641ea2ee908a837da1d03beee6a1dd81fc203db78fc60058ce9b9aad3ee7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation, indicating an attempt to hide malicious code. This JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the PDF JavaScript exploit cluster heuristic. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to exploit vulnerabilities and deliver further malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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
`javascript_obj111611_000.js` `7d3a49f04e78771a21f23a97b8c7b0aa6deefff489cdea1273b59f0328f9f167`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `566f30fe8884aee84f81dbe4ac79e1ef58681f1a12daa66d7120d24c1e7064a4`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3354 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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