PDF malware analysis — malicious · b4ef10798924a889

MALICIOUS

PDF

5.9 KB

MD5: 1d2ab9794ab88be90b47aa0b2d3a369c SHA-1: 54e2440259ad6516e9e152d92e7528dc8caaed57 SHA-256: b4ef10798924a889b4ddfc78e80db2ff8194defc18e722a6c9894aadc8456ccb

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document is malicious, as indicated by the ML classifier and multiple critical heuristic firings related to known PDF exploits (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). These exploits leverage embedded JavaScript, which was extracted and deobfuscated. The deobfuscated JavaScript, identified by ClamAV as Js.Exploit.Shellcode-18, likely downloads and executes a second-stage payload. The specific exploit techniques and the nature of the deobfuscated script strongly suggest a malicious intent, although a specific family could not be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

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)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `61b46047f90b888a00e497def64b956f6da2cb6e69e8905a21e0ba446aa10cd0`	pdf-javascript-stream	PDF /JS object 12 at offset 0x14FB	93 bytes
`info_stride_js_000.js` `ad50d850270662495a71de22b1237fbca96c6b93bd1b31c3a7e77e8b931aa5e5`	deobfuscated-js	PDF /Info fields via stride 6	11345 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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