PDF malware analysis — malicious · 27a741cb535b644c

MALICIOUS

PDF

43.2 KB

MD5: 570c9101fad30c4e6f139e34c0655f8b SHA-1: 03409419a61519353b232f26bf490681fd9c0243 SHA-256: 27a741cb535b644c1b96d4fd53ff76555225769da46614586d96d612b4888b96

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of deobfuscated JS streams. The critical CVE-2009-4324 heuristic specifically points to the exploitation of a vulnerability related to media player actions within the PDF. The deobfuscated JavaScript appears to be designed to download and execute a secondary payload, as suggested by the file name 'legacy_pdfkit_stage_000.js' and the general pattern of PDF exploits. The reconstructed JavaScript string 'app["vie"+"werType"][1]' and the use of '%x'.replace(/x/,'') suggest obfuscation techniques common in exploit kits.

Heuristics 4

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)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `5fa909b8c54ea86e07e3cf745c9e2d7a4e77a572e84aa6e087c8eb726fcb0f5e`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2205 bytes
`legacy_pdfkit_stage_000.js` `e25eb9dea927fc4a67324232040e7bccd1874be12a367fce24d0ca6ae7a3286e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAB8	2744 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` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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