PDF malware analysis — malicious · 91aa96a5d2cf3fca

MALICIOUS

PDF

1.95 MB

MD5: 447e4c193d7513df3ed2444792008dc3 SHA-1: a8510bfa2e3e95e78b47e59d51fdaeb68c71ebcb SHA-256: 91aa96a5d2cf3fcafa864b0e018fa7242d64bd26c79d7dc81c023d439f2b2a81

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link or Hypertext Transfer Protocol T1071.001 Web Protocols

The sample is a PDF file that leverages the CVE-2007-5659 vulnerability through the 'Collab.collectEmailInfo' JavaScript function. This function is used to decode and execute a JavaScript payload. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', indicate the likely intent to download and execute a second-stage payload from a remote source, which is a common technique for malware delivery.

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` `aabd98cb74890c2ac9304456c7c06ac0453274e8678ad14af7c3af60188e0011`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	51 bytes
`javascript_obj0013_001.js` `2b120e10bc20c788cbca2c1803224a38e5da5ad0e446b631ffa267ca94ea1103`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37D	15951 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `9fe4a8d0a22c334a93c7cfd5016906b7100b512822e24aa07f9e8143510914b5`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x37D	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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