PDF malware analysis — malicious · c7be33954cde3bc1

MALICIOUS

PDF

4.0 KB

MD5: 95761990f4dd8f317ab34970717de338 SHA-1: a3c9ec0496f0bb221130df054255b9a64dc9aaed SHA-256: c7be33954cde3bc19156d6fce80f47ea2752ca9419e8f7b3070898a6bebf2d57

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The JavaScript streams, named 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are suspicious due to obfuscation indicators. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristics suggest the script is likely designed to decode and execute arbitrary code, potentially downloading and running a second-stage payload. The lack of readable document body text prevents a more specific determination of the lure, but the technical indicators point to a malicious script execution.

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` `02dfd97726cac7a262218ddd97e8192904ee5db2bc3bde8509d4832f2f95d43f`	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` `8fc28c8490267e3179da772f051bbe65cff7552307a24d9c9f105e3dd48cab2f`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	5546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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