PDF malware analysis — malicious · 7d9df0955c6847b9

MALICIOUS

PDF

11.7 KB

MD5: d37fa7afe0b947c7f0f334e4c5f71459 SHA-1: f81f5cd239402be5fadc93380c7d08317736983f SHA-256: 7d9df0955c6847b9ffedea4af394a7bf8a02057db757fb98e2d6a5baa8a406bc

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Document T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits CVE-2007-5659, specifically targeting the Collab.collectEmailInfo function. The heuristics indicate that this JavaScript is encoded and likely serves as a loader for a secondary stage, as evidenced by the extracted files legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. ClamAV also detected this as Pdf.Exploit.Agent-35903, confirming its malicious nature. The primary attack pattern involves leveraging a known PDF vulnerability to execute arbitrary code.

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-35903 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35903
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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_obj0007_000.js` `860eae5f96eb426380281c575a089242b50523bbb4bbb8dd765e582cd9c07d2e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	294 bytes
`legacy_pdfkit_stage_000.js` `9ec0e2999a18f0b085b0b144f7f8574367b504d0e86a584d6ac3d1ecc7584eb5`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	4931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `ed884a4fcc0f2b3f9e0dff8b0324c21faf5621e420a41752b9c5b5ef66d874b8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	11847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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