PDF malware analysis — malicious · de80eca827edc1b9

MALICIOUS

PDF

4.0 KB

MD5: 6be557328a25817a410fc7ad99d8ba1e SHA-1: 794e43172218c3a9e583d675ab7fd51e189cac97 SHA-256: de80eca827edc1b9c68f1411b5e344c6305c122262c86488c15e6f6040154a21

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 firings suggests that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for exploiting a PDF vulnerability to download and execute a secondary payload. The exact nature of the payload cannot be determined without further analysis of the deobfuscated script content.

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` `7d425e96dd5db0839686d7c5830e9612405c38f85fc440c615cbe19436c23ac3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6261 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` `94278eb26b4c6be1687a017c1e0d0c53fe71d528dcd3d488d3cfefe00e8ceec4`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3543 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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