PDF malware analysis — malicious · 285dfdf2f03a0350

MALICIOUS

PDF

118.7 KB

MD5: b97c5114d568fd866f4ea065a596faed SHA-1: 39e5124799b669d3044b6bf91c01f73c5b813a0c SHA-256: 285dfdf2f03a035089a5850496e08f8b56212ed80fb157efa50c62a7ef635398

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is heavily obfuscated and uses eval() and String.fromCharCode(), indicating an attempt to hide malicious code execution. ClamAV detected this file as Pdf.Exploit.Agent-36086, suggesting it exploits a known PDF vulnerability to deliver a 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` `4b8301cb00581a0e17f801b8e9ecde3da2e8917da5d54066d46e29c177f9efb0`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626947 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` `d2f48153a7a03899569b34efc5f77c5cdb21363ea88e17cbfc947bb8fd2f45ef`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 549 long base64-like blob(s).

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