PDF malware analysis — malicious · 64d63a5dfba13921

MALICIOUS

PDF

30.0 KB Created: 2010-02-17 01:14:09 Authoring application: FPQGAJzRvZjZQ (via ikxVNCXzLKryYzENyBE)

MD5: c75cbccbd7467a55714324023aaf1e77 SHA-1: 1b576f3d7f682acbf357c4aed73d3e65f361384d SHA-256: 64d63a5dfba139215936071bac73f2e181b9c93000b93229030b42fc0b75a19e

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that is flagged as an exploit cluster, including the use of eval() and String.fromCharCode. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript exploit techniques points to a common PDF-based malware delivery mechanism.

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_obj0019_000.js` `e50fd85e4b75651f0d8a2f174b2f316b6c2f0c21fbecfdb1a81811d1041d36e6`	pdf-javascript-stream	PDF /JS object 19 at offset 0x37C8	15332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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