PDF malware analysis — malicious · efea84ed57e9f4ac

MALICIOUS

PDF

118.6 KB

MD5: 8401532719b54c3910c80bdef1cc961d SHA-1: 94838c082cd9d50f8b8e8ca149e41248bc2df9e0 SHA-256: efea84ed57e9f4ac45b953a60d73aaa4f9b129f9db6e93cff43517c9787a4f0e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL

The PDF file contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', 'PDF_EVAL', and 'PDF_FROMCHARCODE'. The critical 'CLAMAV_DETECTION' heuristic further confirms its malicious nature. The presence of a large, comment-padded JavaScript eval stager suggests a complex loading mechanism. The primary intent appears to be the execution of malicious JavaScript, likely to download and execute a second-stage payload, as evidenced by the extracted JavaScript file and the use of eval functions.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `998bb9687c116fa0d7ae4db7049f86838ab14c5da3eb8237b1b12ef30cbfd53c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626991 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).

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