PDF malware analysis — malicious · e8e2966fa3eb784b

MALICIOUS

PDF

4.6 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe

MD5: 323cd2b18026019ab8364efa96893062 SHA-1: 535d3d926c3d35930f837d53ea53d2efa0dccd4b SHA-256: e8e2966fa3eb784b87cc12d1879618737f4223b172b47f1dd26e5a547d60582b

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are leveraged to execute embedded and obfuscated JavaScript. The ClamAV detection of 'Js.Exploit.Shellcode-18' on an extracted artifact further supports the malicious nature. The JavaScript is heavily obfuscated using `eval()` and `unescape()` calls, making its exact function difficult to determine, but it is highly probable that it downloads and executes a second-stage payload.

Heuristics 9

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)
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `8e01b5c311c8b5dc28eeb40b7035db3c45d30d2099ec16736ef7e2b3f235bc70`	pdf-javascript-stream	PDF /JS object 32 at offset 0xCD7	232 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `a00e9163d1954b43e877d1f3511169b7159145eb4afc92ad73e5c81d1e94a44b`	pdf-javascript-stream	PDF /JS object 34 at offset 0xDFF	114 bytes
`javascript_obj0036_002.js` `b38cbd201b14b439724c72151677790c063e33b5a85768d00f8e21edf0f03989`	pdf-javascript-stream	PDF /JS object 36 at offset 0xEEF	100 bytes
`javascript_obj0038_003.js` `5e116f450404f25580d6ca3081093228bec1e173779b9563b0297d50c32ec511`	pdf-javascript-stream	PDF /JS object 38 at offset 0xFD0	62 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `a5a0d916db05eb7480e7e20067cbe385f18b25d2e88370c27af092596b5584b9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1EB	6406 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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