PDF malware analysis — malicious · f545e1ef91872488

MALICIOUS

PDF

4.0 KB

MD5: 5bc2bccd35d3e36bbc71ba50354a35d4 SHA-1: 7455d0c0b7eb31e255c9250969780f0e9e160de5 SHA-256: f545e1ef91872488372fa3f85f3a652d084773b7b0d1ec07c788afac63704c3e

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 PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() for execution. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a second-stage payload. The obfuscation and use of eval() are common techniques for evading detection.

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` `4e2cffa8938cfb93b35eb4c87ba5baf77a7b8958380347743483e8338a1c7967`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6357 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` `05f93f073b88935d7f4e3ec82c456db035e4fe3faebc7e67fc8c1e1f4ff7f8c2`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3615 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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