PDF malware analysis — malicious · 965a2c71e8c0b2af

MALICIOUS

PDF

15.9 KB

MD5: bd5f4b0145db2f1218c8509960f60100 SHA-1: ea5f4041e81435b7da445f99ac4323e865949c09 SHA-256: 965a2c71e8c0b2af73bd81068ec0db0e236ebd6ec75803d200f1b63aa56dc01c

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the `eval()` function and string concatenation to obfuscate its true purpose. The critical heuristic `CVE_2009_4324` indicates the exploitation of a known vulnerability in Adobe Reader via the `media.newPlayer` API, which is used to trigger the JavaScript execution. The embedded JavaScript is likely designed to download and execute a second-stage payload, as suggested by the obfuscated code and the nature of the exploit.

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` `2ac943261d4ab0d16c5ac8adc6943984ee59a6f40071c6049c670cb49d25517d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2649 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_obj111712_001.js` `e43a48e65cad46b8c1d32ba0208bf08f090866de6b413fcde92a2af4ea0943ec`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xC1D	10394 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_obj111713_002.js` `0ac69bb4eb40ea37f04d6abd10039ee7ee7d5cc43d07e59abab94b35861d1258`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x34ED	2638 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `1232e31a3e9915e8496434038a8dcdfeb6ace4d20f594b6f3f0820f1ce0b77fa`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xC1D	1086 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` `cd7088aa0ba5ce42db7faac79c4063dccc339c8953139714658e9cb6b07c91fc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x34ED	165 bytes
`legacy_pdfkit_stage_002.js` `3ae9973ce27ecbdf5346ad5acefd651309470397fa5704fbb99c15e21f749a0e`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xC1D	1252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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