PDF malware analysis — malicious · 19f6ba70f38af82c

MALICIOUS

PDF

8.0 KB

MD5: 196310bdf1b201c9061a1d558a31277b SHA-1: a4334b933236fc68bfd29347b0161c1453e7735b SHA-256: 19f6ba70f38af82c628ef026887f33dc33f85bbab5ad2558952ab5263a04cef1

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Macro: User Execution: Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape() function, indicating malicious intent. The critical heuristic CVE_2007_5659 specifically points to the exploitation of a known vulnerability (Collab.collectEmailInfo) within Adobe Reader. This suggests the primary attack pattern is to leverage this exploit to run arbitrary code. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Exploit.Agent-36086.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
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.
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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0006_000.js` `60e1d2bfaf6edbd8d266ac7467b04a6ad3d499ae00fb58fd292356bf0344d4fd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	471 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` `e4dc5e9d7c4ede22b4d1ea26dbfdc923973777c93690939e7faed2d5472d9b03`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BDA	1821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `82d6089b7c9ce068463e2114f797bf4c88e941b15b216b8919ad079469305561`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x321	5455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `5045f4018e564d7d90e5f137969154a79fc26f01a53c8aa272a2e745dde9704a`	deobfuscated-js	PDF JavaScript deobfuscation pass	25624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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