PDF malware analysis — malicious · 93447577d1a8c551

MALICIOUS

PDF

4.2 KB

MD5: f1f8da76d58a6dd5e18de9b92b19f93c SHA-1: da8feeea48cf77c5818516c5eba088db1a24ddd4 SHA-256: 93447577d1a8c551d956743d80fc00d28dc75907d127e4775f58af196e7cedf9

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated using `eval()` and `String.fromCharCode()`. The critical heuristic firing indicates exploitation of CVE-2007-5659 via the `Collab.collectEmailInfo` method. This method is used to construct and execute JavaScript, likely to download and execute a second-stage payload. The deobfuscated JavaScript is too large to include here, but the analysis indicates it is designed to exploit this vulnerability.

Heuristics 6

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 (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `e78942794bf3edaa93a9d86fd909e7b45ce99f13d9864ba7040bca12694908ed`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22026 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `2c9d2e06681fe23a514885fd19ea463f2dc3dd4098ef369e4c6995aa8f0403e7`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6534 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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