PDF malware analysis — malicious · 53beb79a409c76f4

MALICIOUS

PDF

24.7 KB

MD5: ea2056d0bdbeacef86aae98d47951508 SHA-1: 5bc26f6a29ecc5f1bde0f228863896ba5faa3f68 SHA-256: 53beb79a409c76f4744ef9746d5cef6509a6c144ae3602af1c2c141efb2d5542

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF sample contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The critical 'CVE_2008_2992' firing points to the exploitation of a known vulnerability using 'util.printf' and encoded JavaScript. The deobfuscated scripts suggest the primary intent is to download and execute a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `e7e6e5f82a63b332a540340ce382a2b3ca2392ea6bd61a23665c6fd34a17161c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3337 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` `68f33693276b4dad39c9c6c89deefff36cbf85396c1ae979598ff47406d742a6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xECD	16468 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_obj111713_002.js` `0938c81af213bad88e7358b652146882530473ee9334d9666fbd38b6cd9d3c60`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4F57	4931 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` `f016e0f419e08a4e9233cb7f369ba4631d24001411cced54292eca10906030e6`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xECD	1417 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `e282e90aa5eca950df2ca38b720cea9e6025f175e744e4f996f2c8820ba8b08c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4F57	385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `83f665a42d804a850fb4e22d5d660eb6b462f299cf2ade910f3f2b7040adb6a7`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xECD	1803 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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