PDF malware analysis — malicious · c2d5a4e4742c2451

MALICIOUS

PDF

4.0 KB

MD5: 45a564ed996abffa6077a4ab3fb05d22 SHA-1: 9ccb79cb714f1b3a80076e6871ad2d752c425749 SHA-256: c2d5a4e4742c2451383dca48dd5c16cd1cdc1ed0aadadf482cf123ed351fa024

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, one of which is heavily obfuscated and uses eval() and String.fromCharCode. This indicates the script is designed to dynamically generate and execute code. The presence of 'acroform_b64_00.js' and 'javascript_obj0013_001.js' as extracted artifacts further supports this. The obfuscated JavaScript likely downloads and executes a secondary 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_obj0013_001.js` `a72470159feaad14c9ac306b062710f739304fa6e9add502acf5f269439ee438`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6317 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` `d09ab796aea6d39212038812f15d3a1d9413f6766f8622c691c6758f6b5c7ebb`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3584 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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