PDF malware analysis — malicious · 5280a8b04e7c455b

MALICIOUS

PDF

8.8 KB

MD5: e07c711e0d4299a5346fa0af88c1503d SHA-1: b98d11b407f6839a6d403de72fda01a440dc90d7 SHA-256: 5280a8b04e7c455b5cf01927fd96f3579579fa0b2bb72c4cf8ee8cf1c50b6953

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, triggered by the CVE-2008-2992 vulnerability via util.printf. The JavaScript is heavily obfuscated, but the presence of multiple deobfuscated JS streams suggests a multi-stage download and execution process. The ML classifier strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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)
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_obj0001_000.js` `5545970daefb5e8ebc862f9e484eb4160c806d2220ffc9f75146944faf53ee31`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	64 bytes
`javascript_obj0013_001.js` `0cdb2c480d2c92fcba534eb0ca0ff87ee2a0e8dee0a16dde6ce18d6d4f502ffa`	pdf-javascript-stream	PDF /JS object 13 at offset 0x397	20405 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `b98ea76fd29317fd3706e461a044d0d53c269b494af1c56584456006c6101274`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x397	549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `4c78a47c0ef29e257eaee54eceaf5c1b807d8999aa17938116d30dac7a808db6`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x397	551 bytes
`legacy_pdfkit_stage_002.js` `735b5e2d3f21b18a97c07ccd45e563a13b754d91dff0f52952c705c71a45a4cd`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x397	528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `7bbc9d1a123f1ff7e4a1665e9b9aa05d948d388aacdd96bc6fe207d4fee3ae96`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x397	474 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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