PDF malware analysis — malicious · f79af9dad7e90cea

MALICIOUS

PDF

39.9 KB

MD5: 63fd31473b081ff7e24068c0aac87269 SHA-1: 4c8aeb89f69ac656db9a306d5c105c64df233f81 SHA-256: f79af9dad7e90cea16372b4a5e14421f47f72c81376067c2380fbbc129188432

186 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript and triggers CVE-2007-5659 via the 'collab.collectEmailInfo' function, indicating an exploit attempt. The presence of U3D content and ClamAV detection further supports its malicious nature. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', are likely responsible for downloading and executing a second-stage payload.

Heuristics 7

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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 4

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 0x1A4	294 bytes
`legacy_pdfkit_stage_000.js` `84d003ce16e684318cd021fd4e846bca9cf30a485b1beb5ac51c63e5f9c6b58f`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2EF	5553 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` `ebbfef1d13ea3ab996d2c23bf9790fbc49af685e18760e49b9ec3539db02e1ca`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EF	13057 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).
`u3d_00_off0000335c.bin` `db166b7bf539ceb527a321927dc7262838bbe91b146a4aa26884d46ee5696f20`	pdf-3d-stream	PDF U3D 3D stream at offset 0x335C	27443 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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