PDF malware analysis — malicious · 6047e6ac1ca881ed

MALICIOUS

PDF

12.6 KB

MD5: fd5994f952dfde19d1d6e6b92895ff70 SHA-1: 010ea8139ac4cffeaa20b7972a815ef7766d1c42 SHA-256: 6047e6ac1ca881edcfcc360e7c6819fefaf13f3cacac177c185998eab34d33eb

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that is heavily obfuscated using `String.fromCharCode` and a custom decryption routine. The script's primary function appears to be downloading and executing a second-stage payload from a remote source, as indicated by the `app.launchURL` and `eval` calls after decryption. The ML classifier and exploit cluster heuristics strongly suggest a malicious PDF exploiting a known vulnerability.

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` `f048286b2dfe205330e162117bc9e2e9406092389e25aa91660890d79cb205b6`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	916 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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