PDF malware analysis — malicious · b5d675151f475ba9

MALICIOUS

PDF

15.7 KB

MD5: 7b47488f528cd9ae438c200863877aa1 SHA-1: 9f00dfa69c5d4881160771234ee34dac2b869f33 SHA-256: b5d675151f475ba94e23b94e09e986180450378b4e0b4ae2839f9a9f655de280

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. A high-confidence PDF_EVAL heuristic and a PDF_JS_LARGE_COMMENT_PADDED_EVAL firing suggest that the JavaScript is obfuscated and designed to execute arbitrary code. The ClamAV detection of 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The embedded JavaScript likely acts as a stager to download and execute a secondary payload.

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` `c4b8dbd8400f22b06f51964efa4c0aad6d57dcb32e30f789625e11dcaf6e128d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425393 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` `6150546623a276bfb00f99ed750004955b8f9572a25991113815db448e2312f7`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 534 long base64-like blob(s).

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