PDF malware analysis — malicious · 1c0d5cd72aca7a6d

MALICIOUS

PDF

19.6 KB

MD5: e0dd3e715d829e649bcfec3311ae27e4 SHA-1: 516dc5be4961cfba1ba0a06ea62f93b881cb3143 SHA-256: 1c0d5cd72aca7a6d82018c4a4d626486319a8d738b379c8b64abb7873fec7124

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript that utilizes the `eval()` function and string concatenation, indicating an attempt to obfuscate malicious code. The critical heuristic firing for CVE-2007-5659 (Collab.collectEmailInfo) confirms the exploitation of a known Adobe Reader vulnerability. The embedded JavaScript is designed to download and execute a second-stage payload, as suggested by the deobfuscated scripts and the ML classifier's high confidence score. The primary IOC identified is the CVE-2007-5659 exploit.

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` `fee28b801c9ea35b1daebb2e5141690a97ea33969c1bf2177ffd7d556eb42562`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3808 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` `ffcb0734e68d9cf2c254b7e19d797a214b2ba1e2f1c2e72a9353d299d023b2e0`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10A4	14164 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` `4ff4d04d72c21c6d723dbc63dd9adb1ea7c50a7f0149af4943f42dc188db7056`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x482E	1504 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` `739b13f0b99040e4fcf01de9738665c2b86144f5e81fc507f93a7d4c0821e8ae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10A4	1476 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` `4a6ed67b2b11ef593106b1c3fc17b140bedb4739056b83dafab29876edeece36`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x482E	88 bytes
`legacy_pdfkit_stage_002.js` `612559854d5381650e71771d8e0523924750ecc6b0c28cfa35ca95a0ab3f7259`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10A4	1565 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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