PDF malware analysis — malicious · a419921cae672a55

MALICIOUS

PDF

8.0 KB

MD5: f89905dfb1b2dc523cea87a5dfbd82f0 SHA-1: 37203ed7f8f33b6d4fdfc694a9866806d451332c SHA-256: a419921cae672a5587400f91db074e1417e2829020856bf77c463554c7a78d3e

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and uses a string-reversal technique. The critical heuristic firing for CVE-2007-5659 indicates that the embedded JavaScript is designed to exploit a known vulnerability in older versions of Adobe Reader. The JavaScript likely decodes and executes a second-stage payload, as suggested by the presence of deobfuscated JavaScript artifacts and the ML classifier's high confidence score. The primary attack vector appears to be leveraging the Collab.collectEmailInfo JavaScript function to trigger the exploit.

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` `0f39519cdff63b17fce8c0f22c304057d1f8af0d4db4aa7c66bd2cb40670320b`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	46 bytes
`javascript_obj0013_001.js` `06c218677a6a3364363b7a0916dfe7067aec763a16c4af242f3410b65755d372`	pdf-javascript-stream	PDF /JS object 13 at offset 0x373	14588 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `c8bdef46f9ce63b52c9b556eb1b8887a53acd5405e1e18a2e8cb985c261fab0b`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x373	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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