PDF / .COM malware analysis — malicious · 3b721cd2b04c7319

MALICIOUS

PDF / .COM

22.1 KB

MD5: f5dca2d21b61de07171548a54a2d5f6f SHA-1: 47366ec972d7098b3aab5a932e9c414c2ed4cd41 SHA-256: 3b721cd2b04c7319193614ac9506292b0ca3a1fea45d04a87b109491b0f1c700

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to execute obfuscated code. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known PDF vulnerability. The extracted JavaScript files, particularly the deobfuscated stages, suggest a multi-stage download and execution process. The primary intent appears to be the download and execution of a second-stage payload from a remote source, leveraging the identified PDF vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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)
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `b6aec93730407573caa9ffce36b078357523f3a65c2eacadee9b0112341c6a56`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3493 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_obj111712_001.js` `3d71b613a92d22113f5a4a30457d6498b94dd73db40cf097b4dcb2650cdbbb55`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF69	13984 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).
`javascript_obj111713_002.js` `c487f3179ddbd381d2d8d403ee18a63215166c7a47132f667f63d46ed35e5ce6`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x463F	4538 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).
`legacy_pdfkit_stage_000.js` `ffb74bf131b1bc706cab71d919c8899f5c8b45080e435eaa1f90e37568af98ed`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0xF69	13520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 22 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `f8e30150a6172d8683eca486f2bf9c787fd19a40f66a8d93054fcb9f1f69eacb`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF69	1415 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `4333afd4d46283279c0caf96b9e682a5662324ee4bebeaeca2778cff0ae4c4a9`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x463F	393 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_003.js` `1ec16f934e06b926169808de493f9d0e9bad1e9a69432230a48c719f37d8188d`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF69	1809 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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