PDF malware analysis — malicious · 14accfd4db483d81

MALICIOUS

PDF

3.8 KB

MD5: 893c622ffeb27e1d38715461404dbb23 SHA-1: bda7a36dca062302826e8e2f8894626415856934 SHA-256: 14accfd4db483d8114cf1578c69b3e863f3db5b7edccfac7f948c1d7295dade3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript streams, with one stream exhibiting obfuscation and the use of eval() and String.fromCharCode(). This strongly suggests an attempt to exploit a PDF viewer vulnerability for code execution. The primary script appears to be a downloader or deobfuscator for further malicious content.

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_obj111711_000.js` `35a0f565a7e832e7089b88f24d27f26d70d637cdf036ce961dac53fbea9da86f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	4756 bytes
`javascript_obj111712_001.js` `6364c386eafdc1da9fb56ecedee05d42546184b0536e73dd80c69c84510d2857`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD63	542 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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