PDF malware analysis — malicious · 2e85fba5303c003c

MALICIOUS

PDF

12.2 KB

MD5: 38eade3ec8216b097f57a425b4774ac6 SHA-1: 5e79d5db82710e0040f94295b08bf5ca7c7cbc30 SHA-256: 2e85fba5303c003c654b4860611a29b48ae3b95e6dff21653bacf6fe3afc6b07

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates that the JavaScript is obfuscated and likely exploits a known vulnerability (Collab.collectEmailInfo) to execute arbitrary code. The extracted JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, are deobfuscated and suggest the script's purpose is to download and execute a second-stage payload. The lack of specific indicators for a known family leads to an 'unknown family' classification.

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_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `caafe3c0bb363b3a031db5a8100f7f0b9a3175d76a820afe23ebfcafe290b774`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12012 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `50efa80dfcaab3a3f74e292d641434e06199ba239853770a0fabbad5744e2a2a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5008 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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