PDF malware analysis — malicious · b918e7bbcf681848

MALICIOUS

PDF

118.5 KB

MD5: 8202fff1c43d92ff10b8f4aba1ac7169 SHA-1: c157d7b437f056bd2b685c954135123a6a750173 SHA-256: b918e7bbcf681848927dc1d218419d40316acfc0ca6ef2a42504a4f97802e504

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution and obfuscation, including a 'Large comment-padded JavaScript eval stager'. ClamAV also detected this file as 'Pdf.Exploit.Agent-36086'. The presence of embedded JavaScript, particularly with eval() calls and String.fromCharCode, strongly suggests an attempt to execute malicious code. The primary attack pattern involves leveraging PDF vulnerabilities to run this script, which is likely a downloader for further 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` `e810e03762c570061d20cc0fe7170229c6e0c179b76cde18372d428ee0c5e908`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627109 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).

Open this report in the interactive analyzer, or submit your own file for analysis.