PDF malware analysis — malicious · 55d1b519b7417392

MALICIOUS

PDF

74.2 KB

MD5: 57a3e20f7e4081f32bdfa6482870a02c SHA-1: bbd1eb4b5884d6fcb77dbcdf65cd22e96287387e SHA-256: 55d1b519b7417392c19a4fb484dca7af1c04781f1a7b8c77f290b32a5569bad3

136 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF sample contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, indicated by the 'media.newPlayer' heuristic. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. The 'unescape()' call and 'Hex escape obfuscation' heuristic further support the malicious intent.

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `4dc6db96656517b86bbffe1722102c81e97dfaa7076c17199ec2f38e2b3a6483`	pdf-javascript-stream	PDF /JS object 8 at offset 0x210	2960 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).
`legacy_pdfkit_stage_000.js` `42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x210	126 bytes

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