PDF malware analysis — malicious · 8a3d59fdefcc13df

MALICIOUS

PDF

15.7 KB

MD5: b44e57816bfc6bff1c2499f2b6b4a7f3 SHA-1: 244c5f04d5ebe921f156fa403067bd2ec7c8493f SHA-256: 8a3d59fdefcc13df270b1cb11f763ad033be79aa1ecfa9c4d1790db93627805b

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. A critical heuristic 'CLAMAV_DETECTION' identified the file as 'Pdf.Exploit.Agent-36086'. The presence of 'eval()' and 'String.fromCharCode' within the JavaScript stream suggests obfuscation and dynamic code execution, typical for downloading and executing further malicious content. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic further supports the stager nature of the script.

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` `6424d6a8fd01cd431e5eee5ca01eaa92be71b0c4b74af353b7c6935699968c96`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425706 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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