PDF malware analysis — malicious · 512145fa2c9bbfd5

MALICIOUS

PDF

4.1 KB

MD5: 11edec34afe094d2bbaade772ea51821 SHA-1: c41301a16fdc76cac4e86fba88be347dabcf3a3e SHA-256: 512145fa2c9bbfd55ceaef99bc259329bd21e007159a7a2daa01c3565a370867

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, as evidenced by the PDF_EVAL and PDF_FROMCHARCODE firings, and the presence of deobfuscated JS artifacts. This obfuscated script is designed to download and execute a secondary payload, a common technique for initial access and further infection. The specific URLs or final payloads were not directly extractable due to the obfuscation.

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_obj0013_001.js` `560f0e094fb2777de28c6c1d3783705f63250b34ab5d335cba347a210a9aaffa`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6429 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `0263e531a34c9bd98d2db477358f723e77c9ab84d45e12e505d113e93cfb6efc`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3667 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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