PDF malware analysis — malicious · 0878c01b27f4b9e2

MALICIOUS

PDF

12.4 KB

MD5: 187206abeb8d700de1df3c866aa73b1b SHA-1: 5d66b15d3984e7e365bd64bd9ef1267919230524 SHA-256: 0878c01b27f4b9e237d4b624005bc2b7b808a1d84280f7de924ababd1bcab8fa

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains obfuscated JavaScript that, when deobfuscated, attempts to download and execute a second-stage payload. The script uses `String.fromCharCode` and other obfuscation techniques to hide its malicious intent. The primary technique observed is JavaScript execution within a PDF, likely leading to the exploitation of a client vulnerability to achieve code execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `d2233358777d1aaed8efae57eefbdc7f0ddc83b20eb36c734bc8ee388da7c061`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1418 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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