PDF malware analysis — malicious · 2e90a22c5f6e3011

MALICIOUS

PDF

18.7 KB

MD5: 90aebf5470d0e831ed3ad904cf6bca2a SHA-1: dd3571bf49b2d6266d943ec0370a94b50ae0e64e SHA-256: 2e90a22c5f6e3011ab200bf67b165e79bf0002242f78e89fce11815528d8958a

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to obfuscate malicious code. The heuristic 'CVE_2009_4324: media.newPlayer' strongly suggests exploitation of a known Adobe Reader vulnerability. The deobfuscated JavaScript likely downloads and executes a second-stage payload, although the exact URL or payload is not directly visible in the provided evidence. The reconstructed string literals like 'eval()', 'unescape()', and 'String' are indicative of the obfuscation techniques used.

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` `5988c80e6a589b175a9a939fdd6647f51abdda6ea6f5a333c2536256f806e1b8`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2952 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` `ea080c6c5d649b4859af4c4ea68397be33d8b2fadc6b6cc0be82ff6e29b1eafb`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD4C	13184 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).
`javascript_obj111713_002.js` `cddfd3632e09342eff2bd433e16b7d550cc1b1526a2b4a448857ab440218c192`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4102	2445 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).
`legacy_pdfkit_stage_000.js` `658d5b59a62d8140d5f38ba6a0f2787d4f5f30688f652ef3e638491555d64059`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xD4C	1089 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` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4102	165 bytes
`legacy_pdfkit_stage_002.js` `73d945b15941396ccb635391b584692885272fe33d8ba77620fc5a75ea030018`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD4C	1255 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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