PDF malware analysis — malicious · b8c91b0e9b9b0a3c

MALICIOUS

PDF

118.7 KB

MD5: 90d6e0f4ff707f9ba8fd87f8f919ca07 SHA-1: 2a39953270a13ca2a8272fc90f946a4db26f09e4 SHA-256: b8c91b0e9b9b0a3c26d1b4fd2bacf65d6241b49946e8709b2fdf89424bfcccdb

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript, including a high-severity 'eval()' call and a 'Large comment-padded JavaScript eval stager'. ClamAV also detected this as 'Pdf.Exploit.Agent-36086'. The presence of JavaScript and the specific heuristic firings strongly indicate that the PDF is designed to exploit vulnerabilities and execute arbitrary code, likely to download and run a second-stage payload. The extracted artifact 'javascript_obj0006_000.js' is a key indicator of this malicious activity.

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` `e0e3c9e02edaafd43549cdf5512caf364dae6ef0c673036b6492a04cb4e12c31`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627289 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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