PDF malware analysis — malicious · 892352d3c21549bd

MALICIOUS

PDF

8.4 KB

MD5: 4be45383a37a101a1558368bf58d146a SHA-1: fb0a924ac4713bb8d913ca37fd72264251b920a5 SHA-256: 892352d3c21549bd4dd70d7f6150bf7b4b9a28275cd1ae6e421ed406faa8e25f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE rules suggests the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute arbitrary code. The extracted artifacts, javascript_obj0004_000.js and stream_002_off00001f84.js, further confirm the presence of obfuscated JavaScript. This script is likely designed to download and execute a second-stage payload, a common technique for initial access.

Heuristics 5

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_obj0004_000.js` `4a9fb2757036bb248641d56ab0ad08d8e36952eb94e1f3f6cdbbf81aa9b7b0ab`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001f84.js` `d929d98cbce975925cac86aef4398037744e33640195900df3cf62060afb7b91`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1F84	306 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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