PDF malware analysis — malicious · da76bc704166b6d8

MALICIOUS

PDF

118.5 KB

MD5: c13a7241c0f24e8d66cb378b22a5a0a8 SHA-1: 4df781575d0ff3fa133568655e97dfed6107873d SHA-256: da76bc704166b6d8a681d68ec3a97f3eff8f70aa9687b64e0a4256f1cfdc3230

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_FROMCHARCODE'. A critical heuristic 'PDF_EVAL' and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' suggest the JavaScript is used as a stager to execute further code. ClamAV detection as 'Pdf.Exploit.Agent-36086' confirms its malicious nature. The presence of large, obfuscated JavaScript streams points towards a downloader or exploit execution.

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` `85b83a4df156f44485bc0613c1785d30671ef97a33b8fc0b9a42bbcb6e8fe564`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626714 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` `b8c0967885c1cbf481f90bd929af54991112df55bbad35d2a9ff8e86621e27d0`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 546 long base64-like blob(s).

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