PDF malware analysis — malicious · 493bc5dc95b40070

MALICIOUS

PDF

118.7 KB

MD5: ff30c74d3bc2e7fd50ec79d1cf48a7f1 SHA-1: ac4d1a490a2b1f374d5a98dce1057841a3c98c23 SHA-256: 493bc5dc95b40070df17390b1b0f1c20386d77b20ec94f955c25e54525465ab2

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()`, indicating an attempt to obfuscate malicious code. The `ML_NYX_PDF_MALICIOUS` and `CLAMAV_DETECTION` heuristics, along with the `PDF_JAVASCRIPT` and `PDF_JS_LARGE_COMMENT_PADDED_EVAL` firings, strongly suggest the execution of a malicious script. This script is likely designed to download and execute a second-stage payload, as indicated by the `PDF_EVAL` heuristic and the presence of an extracted JavaScript file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `114b6765bc5bb22b8c890ad8b73e6b3d871ff68488deee30d345f545fa479335`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627816 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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