PDF malware analysis — malicious · 63d3055193253f35

MALICIOUS

PDF

9.4 KB Created: 2008-37-98 19:23:00 Authoring application: Alive Above (via According About)

MD5: 05a4088c520c21e14bf11edd9b780a61 SHA-1: 69cbeb5797f591dca31a638b8827147eab605e84 SHA-256: 63d3055193253f35d616aec239788e7047073818885d4d20b5fa10e37e660dac

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains obfuscated JavaScript, indicated by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_JS_EXPLOIT_CLUSTER. The ML classifier strongly flags this PDF as malicious. The JavaScript is designed to exploit a vulnerability and likely download a second-stage payload, although the exact URL or execution method is obfuscated. The presence of JavaScript and exploit cluster signals points to a client-side execution attack, commonly delivered via spearphishing attachments.

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_obj0013_002.js` `8b551d5ef6870027837b96803abf5824e8fe4f4ca39aa5e2935467893c075b5c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x38C	58375 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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