PDF malware analysis — malicious · 8c4ca1d356aa196b

MALICIOUS

PDF

8.8 KB

MD5: ca70198c8204a80cc5084af69de6c91f SHA-1: 8103486315b906a92db2106a4c3248b94cd03fc7 SHA-256: 8c4ca1d356aa196b96555af06d0cc55972c730a19bc1147968c0d5c23b6692e5

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo function. Static analysis recovered deobfuscated JavaScript streams, indicating the execution of a multi-stage payload. The ML classifier strongly flagged this PDF as malicious. The exact intent of the JavaScript is not fully discernible due to obfuscation, but it is highly probable that it downloads and executes a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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)
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` `6a2146d908b18b17f87f1f440583207a7dc358b2bfeb9e6057ba7f7ba18a4285`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	64 bytes
`javascript_obj0013_001.js` `7b62f977d6457b640532b60052596b4268e77451da3e059ade77139c17d6405a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x397	18635 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `797f4adfe1f3faf454ca5c4e078fcf8d0f219daef383d1336605cd49b0317d55`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x397	591 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` `24ecb8987ca1d84254e970dbea19a5943f574183408f1beca2ae30f27ed78c9e`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x397	605 bytes
`legacy_pdfkit_stage_002.js` `30d55e0173cfa64b8f4858cd2569aa7b5bb15260c42961057e73e4a7f7501d2e`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x397	579 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `d959a0631495fb51fa5a070e32fd85381d01c97a5f15361f69b3e208a230f576`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x397	268 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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