PDF malware analysis — malicious · b87870b15eea2860

MALICIOUS

PDF

17.1 KB

MD5: b8e7475ad7e1df574dede72fce094189 SHA-1: 288e284064bef46e868565f899e01472f0625bac SHA-256: b87870b15eea28607ad78a64b04df8914513f70de51f406e7ee9dbdb1a7ea483

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2009_4324 firing points to the use of a known exploit targeting Adobe Reader. The embedded JavaScript uses eval() and unescape() functions, common in exploit kits to decode and execute malicious code. The script's primary function appears to be downloading and executing a second-stage payload, as suggested by the deobfuscated JavaScript stages.

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` `81207b606263a4e93e4e0274686f7f80e9238c7f50125c37f0afc88149ae7721`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3039 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` `abc046a6e7aee6df7b00c8f558d3d5b19eb1808fe00c2cdd5c0ba5ef571c2076`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDA3	11902 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` `dc395dd5cb8ce891c6861e56d5e9559257316bcd77c3c22201f5d3321b5c8ce8`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3C57	2015 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` `14d9d23d619682a659b666d1537fbe47a8cc4db49b0c37d63714847d39b24a42`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDA3	1080 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 0x3C57	165 bytes
`legacy_pdfkit_stage_002.js` `5a28b8a1cf9038e2d391edb32c4472d4fc2910cc98f13fb214bfea8bff177a49`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDA3	1246 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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