PDF malware analysis — malicious · 9f98620ea648419d

MALICIOUS

PDF

118.6 KB

MD5: 88e8db901540a6656bc7ff3001d9c6ad SHA-1: 8af772e196380b5956161bcf1d5c3f1d3cf1177e SHA-256: 9f98620ea648419d52da3b8844dbad40f0da7b8e6bdf8e18f21d18c16656a15e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval stager' that is designed to run arbitrary code. The presence of `eval()` and `String.fromCharCode` strongly suggests the script is attempting to decode and execute a malicious payload. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature, likely involving exploit delivery.

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` `cffe4b0118ae83cbacb85c8a4a5c7a0fe8f7c745951a6a1177e22628c2c6be3f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626812 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` `353277af6a73592ade3135b76c006dd75d499d2e28664126bf17b033f176153b`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 626 long base64-like blob(s).

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