PDF malware analysis — malicious · faa406cf11d5eb35

MALICIOUS

PDF

4.0 KB

MD5: b6f959f1e11ce63d190315b6fe47f705 SHA-1: 3584fa23f46ce312f5fedc9b08dc6378cc992484 SHA-256: faa406cf11d5eb3553499645322c9fdfce7614ec054892c474473d0cab8734c0

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation, including the use of eval() and String.fromCharCode(), as flagged by PDF_EVAL and PDF_FROMCHARCODE. The deobfuscated JavaScript, found in acroform_b64_00.js, likely downloads and executes a second-stage payload. The presence of obfuscated JavaScript and the potential for payload execution points to a downloader or dropper attack pattern.

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` `44adc4099eee38dadf9350151aa87a005d49bc5471b41f1d7e63c73974bced4b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6305 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` `47bd3698106678cb05081cee1c7d38e41cdfb606665efb2e8f717fdd5a1af915`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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