PDF malware analysis — malicious · c1313e2f694a77dd

MALICIOUS

PDF

118.6 KB

MD5: 7d70bc37c96f9f6ed5bc5cdc541e131e SHA-1: dae56b4d0486933ee9f9e5f6dc9ac37a31da1e25 SHA-256: c1313e2f694a77dd820b2fa4f92c34395124d219640e63ff780d23523400a84c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including obfuscated code that utilizes `eval()` and `String.fromCharCode()`. Heuristics indicate a 'Large comment-padded JavaScript eval stager', suggesting the script is designed to deobfuscate and execute further malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is an exploit attempting to deliver a payload. The document body is unreadable, but the script behavior points to a downloader or exploit dropper.

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` `9d9c2c92126d4ee46a75336b94ce377d429de3843cc687893def5502cd26cb85`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626502 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` `8803f877a6108033cc5efc943ce25d92be383fd7f37d70d3d64713b511687b3f`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 662 long base64-like blob(s).

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