PDF malware analysis — malicious · 1fa201ec42c17765

MALICIOUS

PDF

9.2 KB

MD5: 231c4688ef5adc5c466c23cdaaa19b81 SHA-1: f98d23a2c07ffa0e9bd80eff1a4414065b1083fb SHA-256: 1fa201ec42c1776508b43026ee14111e8e628ecb94aa6159d25b0ced43117609

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The sample is a PDF file that leverages the CVE-2007-5659 vulnerability, specifically targeting the Collab.collectEmailInfo method. This exploit is used to execute embedded JavaScript. The deobfuscated JavaScript streams indicate the execution of further malicious code, likely to download and execute a second-stage payload. The ClamAV detection of Pdf.Exploit.Agent-35905 further confirms its malicious nature.

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)
ClamAV: Pdf.Exploit.Agent-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `5d61072e712fa77df06c5805b1b85c6fe3f2d4cf2f6d24aa9aae3f814c493cba`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11715 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `8f570e629895d76aa97466c4de61fb7f7178697b923665ab935df361b0060b70`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4932 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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