PDF malware analysis — malicious · 206f14f52dc49ebd

MALICIOUS

PDF

20.0 KB

MD5: b689da93b79983ad377b93674d53d720 SHA-1: cd3277d90afa40898ffe5792d3b1a70c4824ef5d SHA-256: 206f14f52dc49ebd6178cc798d8f1de0f0536e120051fae438a8a03b4a1ed346

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the `eval()` function, a common technique for obfuscating malicious code. The critical heuristic firing for CVE-2007-5659 indicates the exploitation of a known vulnerability in Adobe Reader via the `Collab.collectEmailInfo` JavaScript API. The script is designed to download and execute a second-stage payload, as evidenced by the deobfuscated JavaScript streams and the heuristic's mention of encoded stages. The obfuscation techniques used, including string concatenation and the `unescape` function, are typical of exploit kits attempting to evade detection.

Heuristics 5

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
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `39727ba3ede28423ddd843748dd1a534d26af122d96d345823d4ce04db52b64d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3709 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `ea61ff488f373bfa4bf912385d312fcedbecc8ef01bdb1990896822ed14ad5c4`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1041	14533 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `5f46dd3ba218dc02ece2f8202603eb6560ce2c07a78c1af952f0284eb7ec3eba`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x493C	1651 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `8469eb720d33226702343dd70a9ebed8d3602f999f2c401c907509ad9f31e6b7`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x1041	13953 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 38 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `739b13f0b99040e4fcf01de9738665c2b86144f5e81fc507f93a7d4c0821e8ae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1041	1476 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `893b6a69a6b1f96ef94da875e2c6de5a6ab10d72b7676187c78f81073910b29c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x493C	80 bytes
`legacy_pdfkit_stage_003.js` `da21de0b7de07cfcdbead07a7decd30b97ca81e1590da596e5d7e62c7b2180eb`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1041	1557 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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