PDF malware analysis — malicious · 5b619f65dfb6855c

MALICIOUS

PDF

55.7 KB Created: 2009-03-21 16:34:43 Authoring application: XaXebiTC (via JteLVaYwbEwAF4)

MD5: d0bd59e12e1eb58db18c18b1b181b635 SHA-1: ceb85e9cf23c9501fc2b32aedd99374352e4cad2 SHA-256: 5b619f65dfb6855caa45a77ef71711febc3016d8be2c0c76cffe1c7a604686c8

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file containing obfuscated JavaScript. Heuristics indicate the presence of JavaScript exploits, including the use of eval() and fromCharCode, which are commonly used to download and execute further malicious content. The ML classifier strongly flags this PDF as malicious. The JavaScript code appears to be designed to download and execute a second-stage payload, as suggested by the exploit cluster and the ML classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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` `b2687fda29c5103b66c8bedd25881a3a997996483657bb039449734de3b22f4b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23B	55753 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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