PDF malware analysis — malicious · 178f699e88819026

MALICIOUS

PDF

22.2 KB Created: 2010-07-25 10:32:51

MD5: ca97131f26e39c45ab6e38c4819e25bc SHA-1: 01cb0d394c61b8454def5aa863aba19825b9dc5d SHA-256: 178f699e88819026eb8f60e231474c026ab53b6a9d2fecbd82f6fa6a2897977a

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated using String.fromCharCode and variable manipulation. The script attempts to execute further code, indicating it's likely a downloader for a second-stage malicious payload. The ML classifier strongly flags this PDF as malicious, and the heuristics point to a known JavaScript exploit cluster.

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.
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_obj0001_000.js` `308ca4be3d63e57de2e2d4dfc01a08114222f24f6edc55c52da5018df91528d8`	pdf-javascript-stream	PDF /JS object 1 at offset 0x569D	388 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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