PDF malware analysis — malicious · f3065e02b0cb6acc

MALICIOUS

PDF

15.7 KB

MD5: 51071fe0ecc5f0e36e5ce0f7c6d83d79 SHA-1: 87b3c0f5380e825cd667f7f5d0a9fcce80549c55 SHA-256: f3065e02b0cb6acc1e175b52f0e7374320b32b261eee2b46cf0e46806f7c4211

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()`, indicating obfuscated code execution. Heuristics suggest a large comment-padded JavaScript eval stager, commonly used to download and execute further malicious content. The ClamAV detection as 'Pdf.Exploit.Agent-36086' further supports the malicious nature of this PDF, likely exploiting a vulnerability to achieve code execution.

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` `f0300cd3f6d9ecc6cf71b7c0603d40f14a1ac1be5b46929b9e7ee1038838b95b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425115 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` `f6c92c5021a99e129412bf87e7e3f5e4e27da1b71e6326bcd5fcefbe02bf9ee1`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 560 long base64-like blob(s).

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