PDF malware analysis — malicious · 78873bfaef5366c0

MALICIOUS

PDF

11.8 KB

MD5: 8680680c4b2e0414c980336ccfb5213e SHA-1: 0f719f937bf277bb0ed08184c361f0ccd024546d SHA-256: 78873bfaef5366c015ebc2312526e85e72dd3128014c3c1b727a46ea3be15438

146 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The file is a PDF containing embedded JavaScript, identified as malicious by ClamAV (Pdf.Exploit.Agent-35903). The critical heuristic CVE_2007_5659 indicates the use of a known exploit targeting Adobe Reader's `Collab.collectEmailInfo` function. The embedded JavaScript streams, particularly `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`, are likely responsible for downloading and executing a secondary payload, a common technique for exploit kits.

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` `6865bc2aab02ec3030ff184dfa4d8432fa8883556747f6ce5c0a25ca5187b104`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	4986 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` `45f1f5f13f10be1e8c95e50f76726fd680062d9184a5e4b48770cf32364e9d14`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	11860 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).

Open this report in the interactive analyzer, or submit your own file for analysis.