PDF malware analysis — malicious · f7b8075035228e45

MALICIOUS

PDF

2.8 KB

MD5: 5c934a8540a19b29fddfbe7785ebbb9e SHA-1: 4a7c4308448b4365af1441e56ae93e878a5a1fbb SHA-256: f7b8075035228e457aade0acab74898c61bff7b4379c89ee9838bf60904b7d4d

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 suggests that the JavaScript is obfuscated and likely uses eval() to execute arbitrary code. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are suspicious artifacts. The primary function of the script appears to be downloading and executing a second-stage 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_obj111611_000.js` `a64e017fa274e0672df0a586f09a200f249eb100eaa9eb19433792f3e0668b4e`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `e2a6c32b15becb9ef5d7cb88a6a0aa67b2a5c7cc2f756f4174965572b2dd08d1`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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