PDF malware analysis — malicious · 2179fc5b979970c1

MALICIOUS

PDF

8.0 KB

MD5: e9907e7791966741ed8a7d1b4669db25 SHA-1: 6c3d8946bd1b4550569a3564c313941fcd93cc1e SHA-256: 2179fc5b979970c130a7265c6b25eecb1e5d861cede0d906cbb37a3ed1032b1d

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF sample exhibits multiple critical and high severity heuristic firings, including a critical CVE-2007-5659 exploit targeting `collab.collectEmailInfo` and a high severity ML classification. The presence of embedded JavaScript, including `eval()` and `String.fromCharCode()` calls, strongly suggests an attempt to execute malicious code. The JavaScript is likely used to download and execute a second-stage payload, a common technique for initial access and further compromise. The extracted artifacts indicate obfuscated JavaScript, further supporting malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `003e711ad3cfb39920a9d59864722d54a391018f3c2ed3d30cf2a0fd0f8a27c5`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	302 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `0ec9289116253e205e5c909bdab19d06bdc434897b46efff82892b901986ce8a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AC8	1718 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `6663604880ddb775b5a38163815e0cb47eabe9c44c0b77c1b9416c628014230c`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x356	5005 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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