PDF malware analysis — malicious · ba817c9aa8e7049c

MALICIOUS

PDF

118.8 KB

MD5: 6e107e766b78469a06c77a4a5f6c5c7e SHA-1: ac442a0d64718690c44ad47079f9e09d742bbd98 SHA-256: ba817c9aa8e7049c38cdc73c2dc54b8d461559140d6516c8d901fc69b40a139a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript with multiple high-severity heuristic firings, including eval() calls and a large comment-padded eval stager. ClamAV also detected it as Pdf.Exploit.Agent-36086. The presence of JavaScript and eval() suggests the script is designed to deobfuscate and execute malicious code, likely an exploit or a downloader for further stages.

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` `3213e2efc736897047adb3206e0fc5126082d5918aaa7d1947110e4d8d4c759c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626952 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` `c5de7a889533febf58bfb04e78bddc5c782eb0997217434a12fd0688139bb8ea`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 607 long base64-like blob(s).

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