PDF malware analysis — malicious · 91df939aaa481fb9

MALICIOUS

PDF

22.7 KB

MD5: 7b31518a1fda9b27478e069a5d205661 SHA-1: 9ba07f6d99aab6d3870cbd7f80ef326a229d372c SHA-256: 91df939aaa481fb9c1d47a70ddb684ee0994197a65635d83e12cb97704a5469a

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains obfuscated JavaScript, including multiple eval() calls and string concatenations, indicative of exploit kit activity. The critical CVE-2009-0927 heuristic firing confirms the use of a known vulnerability to achieve code execution. The embedded JavaScript streams are likely responsible for downloading and executing a second-stage payload.

Heuristics 5

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)
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` `9c4d0ff5e75e71f0f4f21c154dfae5d344c7961a8c9701e9dd5a485b9d2e203b`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3844 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_obj111712_001.js` `1c32a7e1a659b3ffc9a630443c9f220ec93208b5d2ca8d32d4d6228b2f6ad248`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10C8	17069 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` `bb0244a5053a20eefe26f724c89184ec0f61be0ba46f24c1334edf1bbb624d94`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x53AB	1719 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).
`legacy_pdfkit_stage_000.js` `2091cda1f0bce2ec8b621a25299239f06593e0672cad26a8a458d1590d780c0a`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10C8	1522 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` `1397a77c63e5e8be02a059fd3c671fb708b92cb64d00ded4f2045e71093dec16`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x53AB	99 bytes
`legacy_pdfkit_stage_002.js` `3b2c364b5efe944dc3c9e698ca082df465f9d902eeadab7c679e6c457d4cc1ad`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10C8	1622 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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