PDF malware analysis — malicious · 001cb1071ee90694

MALICIOUS

PDF

25.1 KB

MD5: 19f396a061b03e8370a68b3c2d6ca7b7 SHA-1: 5b27a2eecdd08d1a4e5c7942181460e631d59cfc SHA-256: 001cb1071ee9069461a90220936a8db59c3b6f16b06f17654b2d61312bd89c78

270 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits CVE-2008-2992, leveraging the util.printf function. This script is designed to download a second-stage payload from the URL http://tieos.com/new/post.php?e=6&&. The presence of shellcode download URLs and critical heuristic firings strongly indicate a malicious downloader.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV: Win.Trojan.Agent-36170 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36170
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://tieos.com/new/post.php?e=6&&

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `e7beec23647fdc2b83b637820bf5f287c0721681466e514d759df7b1ecc2a15e`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1667 bytes
Detection ClamAV: Win.Trojan.Agent-36170 Obfuscation or payload: unlikely
`javascript_obj0008_001.js` `b14e99451b5186a27a0218c2a70b93ab69ac1f3d8f09696a355e5b633e11ca26`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	25180 bytes
Detection ClamAV: Win.Trojan.Agent-36170 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `bafdfe3e29801644a3418f0a124f1b74f09064eab6d1a804fe4ea681b1a96467`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x89E	1547 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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