PDF malware analysis — malicious · 62e49b84263fed8d

MALICIOUS

PDF

6.7 KB Created: 2010-07-25 10:32:51 Authoring application: FPDF 1.6

MD5: 80617824cf015b8baa810457eae58445 SHA-1: f892d160f8478ec64794f8425a962cc0e5018e7f SHA-256: 62e49b84263fed8defbd123798f20638101223ec587778070bb67a32f3b45781

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. Heuristics indicate this JavaScript is part of an exploit cluster, likely designed to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious. The specific URL for the payload download could not be fully reconstructed due to obfuscation, but the presence of the JavaScript exploit is a clear indicator of malicious intent.

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_obj0007_000.js` `5e6ef080a55adf97b6c46fcc3cb93d6e5261c8cf5080c67b1006fe4d251ce3d0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EB	5980 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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