PDF malware analysis — malicious · 4a86e03ad1e1e5b8

MALICIOUS

PDF

2.9 KB

MD5: 90adfa3451ec4a25543b63c934d0ff05 SHA-1: 568d44bf82eb07146f14d26c215a87944f0ce8ac SHA-256: 4a86e03ad1e1e5b8cac8c9c07f87c5807862cedd2becb6ddd6a7700f257877dd

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that utilizes the 'eval()' function and 'String.fromCharCode()' for obfuscation. A critical heuristic firing indicates the exploitation of CVE-2009-4324 via the 'media.newPlayer' object, which is used to launch the JavaScript. The JavaScript is further deobfuscated into 'numeric_charcode_stage_000.js', suggesting it is designed to download and execute a secondary payload. The lack of specific IOCs beyond the CVE identifier limits further attribution.

Heuristics 6

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 (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `a9a512196e830bbb4f5ce8632664ad08691e0d7aaac870366ba185cbdc125e85`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	12128 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `1ef3917e0f3c61a2f6793de186316ac3623231955d92cc4f3eb963c77ab54f8f`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	3525 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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