PDF / .COM malware analysis — malicious · 39da70a223698075

MALICIOUS

PDF / .COM

20.6 KB

MD5: f27423964048dc0715794de22b0589c0 SHA-1: 7f612ee56a5c80403be15942f127f8c4fffb0bd9 SHA-256: 39da70a223698075e43d4456245cb2e433624cd0658bdf3ebcd9c64d344e3b0d

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF sample contains obfuscated JavaScript, including multiple calls to eval() and unescape(), indicating an attempt to hide malicious code. The critical CVE-2007-5659 heuristic firing confirms the exploitation of a known vulnerability in Adobe Reader via the Collab.collectEmailInfo function. The deobfuscated JavaScript stages suggest the primary purpose is to download and execute a secondary payload. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (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` `c22e19af0cb55e7bd1c7e5584200525c624785b49d5e367764b83ef35c5a160c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3443 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` `cae725786c63fb5b5b5de06e801a7ed7c75e2d052a93710a7d670641ca4f5eb6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF37	15476 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` `57d719bc0f6207fc58dcdc3f96e6e1ee27008ff49d14f495c785c95fba33b3e6`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4BE1	1583 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).
`legacy_pdfkit_stage_000.js` `89ab59dd1e5ee98fc4bc0017e8936dc154c27c94e7f7bc2b6049a78f280ee26d`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF37	1487 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` `a799876b41713617bf6161cc945b860e44e21ce7ee3703feee98859ab7d7c411`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4BE1	83 bytes
`legacy_pdfkit_stage_002.js` `15d59b736f1947687398ea1ab2c9112e402d6b83dcd3b4ffa85aad71a458c033`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF37	1571 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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