PDF malware analysis — malicious · 480b0c4669cbe27d

MALICIOUS

PDF

15.7 KB

MD5: d0fb3eb2fa95d5ba637e98077185501f SHA-1: 4bc7639e565d3ddcfd068f039ef28617e2cadd6d SHA-256: 480b0c4669cbe27d3ed9047aa4afb6201c822fd26a1ad5ff02d00d884b43b55a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, including a heavily obfuscated stager that utilizes `eval()` and `String.fromCharCode()`. This stager is designed to decode and execute further malicious code, as indicated by the 'Large comment-padded JavaScript eval stager' heuristic. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests exploitation of a known PDF vulnerability to achieve arbitrary code execution, likely for downloading and executing a second-stage 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` `b9e6645661f1424dee2ddd35f9358f9aabb50ab8306be1d2f4add96205bb0842`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424500 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` `49bfc551d016ac68a8e546379e7039069bf9a21dec7ba37c454a8a81b3dc9d22`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 508 long base64-like blob(s).

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