PDF malware analysis — malicious · 018844da8f2bedc9

MALICIOUS

PDF

2.7 KB

MD5: a60e5eabe0358ad0ebe37568c6472ce5 SHA-1: d45b794ac57c390cc3b50559d7836fc69a057f3b SHA-256: 018844da8f2bedc94b11627e4369866df11f098bdc3938d32ef176fa26c1e7eb

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains embedded JavaScript, which is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()` functions. This script is designed to decode and execute a second-stage payload, likely from a remote source. The ML classifier strongly indicates maliciousness, and the combination of PDF JavaScript exploits points to a common delivery technique for malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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_obj111711_000.js` `630d4430db1037a125ea8f70714d59a39cb6c335d06e00d8737335d22b32651e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2599 bytes
`javascript_obj111712_001.js` `93c9bd0c2c9633721c4876515b79c374bb9470d9a26e13ac2db5f5046a8e03b6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x8CF	516 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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