PDF malware analysis — malicious · 78fd8d4db75ccfa0

MALICIOUS

PDF

118.5 KB

MD5: cac67d8cc86495110d1f63504e5a306b SHA-1: 9e5f6d61434d6af820443b4338a7256676aecfed SHA-256: 78fd8d4db75ccfa0b703369fa9935a030293814e0d9e8cfeeb5e0464db6ad191

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV detection and high severity heuristics for PDF JavaScript evaluation indicate this PDF is designed to exploit vulnerabilities. The embedded JavaScript, particularly the 'Large comment-padded JavaScript eval stager', strongly suggests it's a downloader or stager for further malicious activity. While the exact payload is not visible, the techniques used point to a common PDF-based 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `f57edd5beacfc54286ace0da81508b15d082bfc19b94c4484c21d5fd03f2c5b4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627035 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` `619233c1f84a7a93203b3fd53bbc8c9cecbfa6b8340d89993cbd79ce6d0a5795`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 605 long base64-like blob(s).

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