PDF malware analysis — malicious · 20bebb7da9ae1411

MALICIOUS

PDF

15.8 KB

MD5: bbed0771fc0b964d63ea81b497ec4cb9 SHA-1: 1ac43c556548a5c30c6492c351c083653207005e SHA-256: 20bebb7da9ae1411c0b6b38ec04e92560607448f49c915e71d66cd3e257c3bac

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and a critical CVE_2009_4324 alert. The JavaScript utilizes eval() and unescape() functions, common in exploit kits, to decode and execute a payload. The presence of multiple deobfuscated JavaScript files suggests a multi-stage attack. The primary technique observed is the exploitation of CVE-2009-4324 via JavaScript embedded within the PDF.

Heuristics 5

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `3bc0e433ee531456a69eedc61d1fabffe3e0d12a4c0d7c0e07c5dc2d62d271b8`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3553 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `97a39003e9501a749fe0cbb70734c0eb13e81375caff265d19549ed649d72ff0`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xFA5	9937 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111713_002.js` `850e5912884f07c69867494aebd9c15f287631dfffcee0edc405843b5cfb7103`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x36AC	2131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `53e2cbcacbcf20bfe32b3e549c393f1f263444bea7a033ead02699e57c67e27b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xFA5	1088 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `e105a74f9c388b9680c8be60d49377744761164d75cd742fb4431280d16eedf5`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x36AC	171 bytes
`legacy_pdfkit_stage_002.js` `9fe28ca94d4e928caa8656c87445bfddd9dfa70f99fe4ae2ea225cd364414e81`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xFA5	1260 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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