PDF malware analysis — malicious · f1df8c36bba185b0

MALICIOUS

PDF

118.5 KB

MD5: 041caeb55610219f6636cb6527e77cf0 SHA-1: f660687d291affc4c672483818208a4bf95b966a SHA-256: f1df8c36bba185b0e37646956f69c80e109d64dbb5891dc4b2e6e3e9977b3d70

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode() functions. Heuristics indicate a large comment-padded JavaScript eval stager, suggesting the script's primary purpose is to decode and execute further malicious code. ClamAV detection as 'Pdf.Exploit.Agent-36086' confirms its malicious nature, likely involving exploit delivery.

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` `a806aa4446b0c5ef913ce870ee354ec30ddb22853d3678b1e3146d7b73aaba29`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626754 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` `a20517cb957d2d02c5bdec7e45cf942b8502e672d509c783a7b536b55980659a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 475 long base64-like blob(s).

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