PDF malware analysis — malicious · e9dd4dbabc7688b6

MALICIOUS

PDF

23.8 KB

MD5: d34a5190ec5c8daf68b066f0205b1a31 SHA-1: 9150a3f39294f6b242f47b236a6cf271063d7f5b SHA-256: e9dd4dbabc7688b6a60d4d2988370dd25e3d8e5878e67ad7f2a13095b0bfbeea

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains multiple embedded JavaScript streams, with a critical heuristic firing for CVE-2008-2992 due to the use of eval() and unescape() on obfuscated code. The document body reveals string concatenation used to build JavaScript functions, indicating an attempt to hide malicious code. The primary intent appears to be the execution of this obfuscated JavaScript, which likely downloads and executes a second-stage payload, a common technique for exploit kits.

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` `c2e29c721979fc9fe3568cdb9eb6a4753f7cfdd3014aa579b2296cb298866f48`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	4070 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` `f406cde40039f099c5eac835d3d17d663ce1149d4bf50b41567b0cf447db1622`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x11AA	15105 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_obj111713_002.js` `12969d5c44ca7ca0eb95f5ac1f6d28351401904035adf8f77d394f2f370a18d0`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4CE1	4615 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` `2ce519949289064cac4d9ec5e2f03616b7ef69d371aebd8dd98fe04454eb0f63`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x11AA	1413 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` `a43c3c4cfaf5c2e9f4926e75ad36814a7cd0695d53b63dfc2ea20243affbdd9e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4CE1	388 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `1063704576ac16793664eddc1a057fe7c391e7625a2176aedfc1a667bde8dc2a`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x11AA	1802 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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