PDF malware analysis — malicious · 6f8c84869cd8713b

MALICIOUS

PDF

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

MD5: ebb0fd4f893b6347b11d3a0e29423b63 SHA-1: b63a72811de4fd7782a23f166bcf2d88c536f59d SHA-256: 6f8c84869cd8713bcdb2f4990e7e1a31a8ce30df80436a722e0db8b64fa20127

116 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript that utilizes String.fromCharCode to construct and execute code. The script appears to be designed to download and execute a second-stage payload, as indicated by the 'PDF JavaScript exploit cluster' heuristic and the ML classifier flagging it as malicious. The specific JavaScript code is too obfuscated to definitively determine the exact payload or C2 server, hence the 'unknown family' designation.

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` `04553cf0c1d7c49af3f09f7ee56ed5e282bc9dfad69ab0e5276e753883aca7d9`	pdf-javascript-stream	PDF /JS object 1 at offset 0x565D	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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