PDF malware analysis — malicious · 237298af4a135508

MALICIOUS

PDF

118.5 KB

MD5: b665d573a8df59b1fda698b24091ea2b SHA-1: cfa8236776a73fe389468ee51f4ef53c4644ef2a SHA-256: 237298af4a135508bd033c6a2e656c75f7be1a3d2a801dcc604f65573cd4cac9

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains embedded JavaScript, identified by heuristics such as PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. A critical heuristic, CLAMAV_DETECTION, flags the file as 'Pdf.Exploit.Agent-36086'. The JavaScript stream, particularly the 'Large comment-padded JavaScript eval stager', strongly suggests it's designed to download and execute a secondary payload. The presence of obfuscated JavaScript and the nature of the detection indicate a malicious exploit delivery mechanism.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `2ec5fbc440b2c3dd88b97ce9791ab3472447d2d52995d3f7bc7b32a6f196857e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626337 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).

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