PDF malware analysis — malicious · ecd4dfe377886439

MALICIOUS

PDF

8.5 KB

MD5: 3385d4f6fd7054f4d1d3872e6b083b97 SHA-1: 325e3f493d280d7a0f49ec5919093b5844264856 SHA-256: ecd4dfe377886439ffb5706eee70170fd98f3d8614f9d0274f370b2876f3a172

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2007_5659' heuristic specifically points to the use of the Collab.collectEmailInfo method to execute decoded JavaScript, which is a known technique for exploiting PDF vulnerabilities. The ML classifier also strongly flagged this PDF as malicious. The deobfuscated JavaScript, 'legacy_pdfkit_stage_000.js', likely downloads and executes a second-stage payload, although the exact URL or payload could not be reconstructed from the provided evidence.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `e007a24470d6ee337417a0d27d1e08f0a196cf8d249be97bbe7956cc6ca54f9c`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	45 bytes
`javascript_obj0013_001.js` `268adc5e65ebd3eaf93e423836be195cfef64b2812e3c96c16cbb95d513927d1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x371	17195 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `15053e350188ae1f6ac4333c0ef453c4af7b41aeaa90254ed7427237f13a293e`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x371	2043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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