PDF malware analysis — malicious · ae6015c4d7db5b72

MALICIOUS

PDF

4.0 KB

MD5: 19608b42642288787f6b76fc58dfd430 SHA-1: 3f3adecae4efc9bcc136b92cc992e5fb9ef6ff7e SHA-256: ae6015c4d7db5b72643c435d5ad477e7fad181533b8264e0279e6ede236617e6

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'acroform_b64_00.js' and 'javascript_obj0013_001.js' files were extracted, with one being a deobfuscated JavaScript stream. The presence of 'eval()' and 'String.fromCharCode' suggests the script is designed to execute obfuscated code, likely to download and run a second-stage payload. The confidence is moderate due to the obfuscation and lack of specific IOCs like URLs or hashes.

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` `81358bebd5d0c2598af632ae4c53192d1be258432062a56e5e76f69830674025`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6341 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` `e760f6122638bd80ded6310af17d64a212504e1b4ac698f3190820ad5b77ccfc`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3601 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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