PDF malware analysis — malicious · 80f38a1f063a52f8

MALICIOUS

PDF

2.6 KB

MD5: 010c3b91ec9b9587a3b4f6a892f07677 SHA-1: 8705de01c3822ded8de0cfe3876d9f41f5fc961b SHA-256: 80f38a1f063a52f890b24f3241a6a1c40a7141c8032ebe760123371ac48deba8

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript streams that utilize eval() and String.fromCharCode() for obfuscation and execution. The primary script, javascript_obj111612_001.js, appears to be a downloader that constructs a URL from concatenated string fragments, though the full URL could not be fully reconstructed due to truncation. This script is designed to fetch and execute a secondary payload, indicating a typical dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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. (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `f9da81db3d77a651c99de5d0fb428881fe90a1fccb6294b78a98f0816476dcb8`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `ecb9dacb3d7239ad1e40870484f5aca22e7ea2d0a0dec2c30a8efa6f8bcb51d0`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3303 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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