PDF malware analysis — malicious · 7c4afef7a2e7f497

MALICIOUS

PDF

118.7 KB

MD5: 4e34f2e9271317db40ec91f6364a7737 SHA-1: 8e9656c9434c44fdb8c888374b65211b4c117aed SHA-256: 7c4afef7a2e7f497cecaa403b7ad2ea4032ffd1cbfd99943c2d349b5aa9654e3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager, which is a common technique for obfuscating malicious code. The presence of `eval()` and `String.fromCharCode` further indicates code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests exploit activity. The primary function of the JavaScript appears to be downloading and executing a second-stage payload, as indicated by the heuristic firings and the nature of such embedded scripts.

Heuristics 7

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `d279b069f2ececaebf31381516bc71bf77cbe441a043b1bea086290e149d955d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627072 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).
`legacy_pdfkit_stage_000.js` `12e358c8f215c9a5c8a348389d048ec031769d21b5704ba2e2d02946ce0f4fc4`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 576 long base64-like blob(s).

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