PDF malware analysis — malicious · 52787cab5ec2cf03

MALICIOUS

PDF

118.6 KB

MD5: 252a06268e2c4e14a7557cd37224c82d SHA-1: 61b51b7a50c9971fd03c91e12c5d63fdfc1b13b5 SHA-256: 52787cab5ec2cf0345624b9d44b2bd8812eccbe4f7bb0e703527b9b8b10c00fa

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, with multiple heuristics indicating obfuscation and the use of eval() and String.fromCharCode. A critical ClamAV detection (Pdf.Exploit.Agent-36086) and a high-severity heuristic for a 'Large comment-padded JavaScript eval stager' strongly suggest this is an exploit document. The embedded JavaScript file 'javascript_obj0006_000.js' is the primary artifact. The script's purpose is to execute malicious code, likely downloading and running 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `463684d0f6cd03449367bf9f566b054df14e34852d43905264bd1ad4783e52fe`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626465 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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