PDF malware analysis — malicious · 41e5b74ce81921e8

MALICIOUS

PDF

2.2 KB

MD5: 6e2f5a76b845833d70470550bb728e99 SHA-1: 0b244733ed19dba25505afe0a6ee75f608f07c2e SHA-256: 41e5b74ce81921e8cc12000ff1433a361d435a90076f10ea1333426288228a51

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, PDF_UNESCAPE, and PDF_FROMCHARCODE. The ClamAV detection of 'Pdf.Exploit.Agent-36082' strongly suggests it's a malicious PDF exploit. The embedded JavaScript is heavily obfuscated, making its exact function difficult to determine, but the presence of eval() and unescape() calls points towards dynamic code execution, likely to download and execute a secondary payload. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'legacy_pdfkit_stage_000.js', further support the presence of malicious scripts.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36082 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36082
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj111611_000.js` `772da696bdb365f3f1eb4ea6af881baad391be62f3591b19f2f9827fcc4c9b53`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7E6	479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `16550bbdd0e5d91ed4b1f7ab12786e7d0346e221d9cd6d8891e5b447948e65d9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2834 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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