PDF malware analysis — malicious · 6281097913d483fe

MALICIOUS

PDF

118.6 KB

MD5: f6c7ea9942e9db8a7831d61dbbe61295 SHA-1: 41f316271f701482dd83bf61b3e03379201e21d6 SHA-256: 6281097913d483fe1a445c873b45c3355ef5129b57664cb4ccb52dd7c65dbe8b

256 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains multiple JavaScript streams, including one with a large comment-padded eval stager, and triggers critical heuristics related to JavaScript exploits. The presence of PDF_EVAL and PDF_FROMCHARCODE firings, along with ML classification and ClamAV detection, strongly indicates malicious JavaScript execution. This JavaScript is designed to download and execute a secondary payload, as suggested by the exploit cluster heuristics.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `ff1641d7f8851f7ae9175e9aad76b770561cb9b4be780c6b1da29a7aaddeee25`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626644 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`javascript_obj0006_001.js` `3b8ef8a604a813c31682087edb73d7edbcd03d985245163d562a63504f646344`	pdf-javascript-stream	PDF /JS object 6 at offset 0x179	524288 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 36 long base64-like blob(s).
`stream_001_off0001d6d1.bin` `23d17845ad3a0cd0f2756b2fb43ef813232314faf2d5a0cf3af441be9c4319c4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6D1	300 bytes

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