PDF malware analysis — malicious · fd3983839d50911a

MALICIOUS

PDF

4.1 KB

MD5: 2068bb84662fc5e04891fdf263dc315e SHA-1: 6b7f50cce176a6f8fa1dc1217f38454875c03e58 SHA-256: fd3983839d50911ab979b922a0f08ec3e74fad12ff9ee78036844bfecddc7329

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript streams, particularly 'acroform_b64_00.js', appear to be obfuscated and utilize eval() and String.fromCharCode() to decode and execute malicious code. This script is likely responsible for downloading and executing a second-stage payload. The presence of obfuscated JavaScript and the use of eval() strongly suggest a malicious intent to bypass detection and deliver further malware.

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` `e5dda9048e518f5e6312db65e77b52f545ab5a7e877c9d645f43f19f1378c13e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6465 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` `4d89fb3bcaf975e200f103d3970729b90aeea5461165c83b9095271e438cec60`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3694 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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