PDF malware analysis — malicious · 99422bb89bcb7a37

MALICIOUS

PDF

9.4 KB

MD5: a4d70e1f8e65461b45e33b8bdfac070b SHA-1: 2fc00dce2189e452382b515fee3c1c4fe6ab8f6f SHA-256: 99422bb89bcb7a374eb6a4458a097d69d2972e5882631482eee1d33f08549829

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file that contains embedded JavaScript, which is a common technique for exploiting PDF reader vulnerabilities. The critical heuristic 'CVE_2007_5659' specifically indicates the use of the Collab.collectEmailInfo method, a known exploit vector. The JavaScript is obfuscated and uses 'unescape()' calls, further suggesting malicious intent. The primary goal appears to be the execution of this script to download and run a second-stage payload, as indicated by the ClamAV detection 'Pdf.Exploit.Agent-35905'.

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` `1c620aea8c7ff66e2e06f6c41ad73a99390ae80ff72906d4d9921b05ab35f432`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12099 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` `57bebf8d04a3be00cd858d23ced53cd6057e29d37b52856f1a09081286d4db0e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5009 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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